This could be the problem I.e. Finally, we can use resistors to divide voltages. For example, let’s look at a light or switch. On all of the units that had failed, one of the three resistors had failed open circuit. The elevator control panel is the key engineering control mechanism of the entire elevator. It is then that transistors may fail. The better you fill out the form the more accurate your quote will be. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. A digital multimeter is a test tool used to measure two or more electrical values. RMS is an average so that a waveform could have a low RMS value but a very high peak value (for example, a signal composed of narrow pulses). The RMS voltage is more appropriate for checking the power being dissipated in the resistor. To test your resistor, first, remove power from the circuit containing the resistor. Sometimes you will only have low and high speed settings. And resistors can fail due to stresses. A third cause of resistor failure to put on the list is excess energy. Small and cheap, ideal for hookups. I recommend Vishay (BC Components nee Philips) VR25 resistors for this service if you care about reliability. Probably the coating is bad. However, most resistors tend to not suffer significant changes until the temperature resulted from a surge closes in to a problematic rate. Since it is not due to overtemperature but overvoltage, the failure will not be visible on the outside. The bad resistor was taken out of the circuit to measure its resistance. both L and N get raised to some absurdly high transient voltage whilst earth remains pretty much steady at ground potential. Knowing how and why resistors fail are as important as to why we use them. They do this by creating a voltage drop. In conclusion, to learn more about resistor color code guides here. @markrages Thanks for the suggestion. For surface mount resistors, there wil be a '0' on it indicating it is a zero-ohm resistor. Limiting logic gates input current with serial resistors reading their electrical characteristics. What if a component in your circuit requires less voltage than the rest of your circuit? The peak voltage is appropriate for checking against a maximum voltage specification. You can see this on the image below. I will talk to our hardware engineer to see if they can be done. How can I write a bigoted narrator while making it clear he is wrong? Relative Failure Rates for Resistors Understanding the zero current in a simple circuit. Read the complete blog to understand and to choose right braking resistors. ... but sooner or later it will fail catastrophically in some way (melt, explode, become an open circuit, etc). Small package wire-wound resistors do not exist in a 180 k value. The max overload voltage is 500V, which is well above the peak voltage seen here. For instance, when they overheat. The resistor will create a voltage drop. Most likely, there is internal failure of the insulation. Even with the best design, the best components, and a new motor this can occur – often for seemingly inexplicable reasons. The excerpt of the resistor (Metal Film type) is shown below (I do not have the full datasheet): The measurement on R10 and GND (the voltage drop across R12 is less than 3.3V) is shown below (the peak is about 320V): It is my experience (failure analysis) that 1% metal film resistors are not reliable long term with high voltage DC on them. What is the resistor datasheet? Figure 2. The short circuit failure mode is again unlikely for variable resistors. Yes, all this is within the rated working voltage. Find out exact time when the Ubuntu machine was rebooted, Writing thesis that rebuts advisor's theory. Making statements based on opinion; back them up with references or personal experience. Why Do Blower Motor Resistors Fail? Thus AC or DC is irrelevant especially since we are talking about peak voltage. How to retrieve minimum unique values from list? You can find this on the label or color code guide. The reason for this is that other components such as resistors may change their values with age, especially if they are subject to heating effects caused by current flow. Podcast Episode 299: It’s hard to get hacked worse than this. Did the failed resistors really burn up, or just fracture in the middle? In other words, let’s dive into voltage spike example. How are you checking continuity on bad resistors? The resistor specification from the manufacturer is: Since R10 withstands an AC signal, the Vrms it sees is less than 300V. Since the polarity is always the same, it makes sense to me that in the long term it would behave "almost as good as" DC. We also put a more-than-usual load on the board. There was no visible fault. @Barry Should we look at the max overload voltage instead of the max working voltage for the peak voltage? And resistors can fail due to stresses. We applied the same test to a resistor from another manufacturer and it survived. Over time, that heat can cause the resistor to fail naturally. I have no clue on how R10 would die. Is the MOV, R5, at the mains input too slow for that? Also some pictures of this might help. The ignition coil is an important component of the engine start-up process. Thanks for contributing an answer to Electrical Engineering Stack Exchange! Why Tuning AC Motors Help Lifetime and Drive Output. I thought the max working voltage is specified as Vrms/Vdc. You will probably see any circuit without it.It is used for, Blower motor resistors are a small component that is forced to take on a lot of heat and current flow which can make them wear out rather quickly. Keep the thermal effect (Seebeck effect) in mind. Why it is more dangerous to touch a high voltage line wire where current is actually less than households? Resistors ensure components receive the proper voltage. First, are principally voltage or volts. They're tested at 100VDC, but have a "rating" of 1600VDC. However, the most common complaint when this part fails is that only the high speed setting functions. Each component in an electrical circuit requires a specific voltage. Resistors can fail open or short, alongside their value changing under environmental conditions and outside performance limits. Obviously, you want to avoid condensing humidity when power is applied or bad things (tm) could happen. What causes this resistor to fail - open circuit and no visible damage? This will give you a much more extensive repair than if you had the ballast resistor replaced in the beginning. Resistors are so important to the electrical circuits because we use them every day. A driver should pay attention to possible symptoms surrounding … Is there any way to examine the dead bodies of R10 to determine the cause? Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Note! Resistance drift and excess noise can also be a problem as the wiper arm ages. Why are some Old English suffixes marked with a preceding asterisk? How would one justify public funding for non-STEM (or unprofitable) college majors to a non college educated taxpayer? The old trick is to use several resistors in series, instead of single small high-impedance resistors. It only takes a minute to sign up. Resistors can fail in an open configuration. The resistor will create a voltage drop by slowing down, or resisting, the electrons as they try to flow. The wattage it withstands is also less than 1/4 W. But R10 on a few boards just failed and they are now open circuit/huge resistance and there is no burn mark on the outside. They can protect a component from voltage spikes. The resistor in question is not protected against lightning strikes to live and neutral relative to earth. If you're trying to hook up a 2-ohm resistor to a 120V source, you need to size the resistor appropriately or it won't function as intended. Working voltage is defined in terms of DC, but I suspect that consistent application of this voltage for a few milliseconds, at a 100 or 120 Hz rate for prolonged periods of time, may well count as exceeding the working voltage. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. We also use resistors to adjust signal levels. As a bonus, you get better creepage, which is critical if you're doing this with SMT components. Why is it that when we say a balloon pops, we say "exploded" not "imploded"? We have shipped some boards and got some damaged ones back with R10 damaged. In or out of circuit, etc? It’s actually a pretty boring device. They are often built-in to other components. Well, maybe it gets warm, but that’s it. Or should I just look at the peak voltage? I am totally confused. To my knowledge, a resistor is the part of almost every electronic circuit. Moreover, measure the resistor. I've also seen huge changes in value without them complete going open. If you're working on any circuit involving LEDs, you may have come across warnings or recommendations to always use a current limiting resistor. Use MathJax to format equations. use 4 or 5 smaller resistors in series. This electrical current lives in an electronic circuit. And, finally there is resistance or ohms. Excessive humidity may cause an increase in resistance. Zero-ohm Resistors. The resistor in question is R10 (523K 1% 1/4W) in the circuit below: The resistor is reported to fail as open circuit and there is no visible damage. Max dielectric withstanding voltage: 500V. Avoid resistors that are radially wired; axial designs are preferred. :-). Next measure the resistance. A resistor controls the flow of the electrical current within a circuit. What would happen if a 10-kg cube of iron, at a temperature close to 0 kelvin, suddenly appeared in your living room? In conclusion, if a component receives too much voltage, consequently it will damage and not function. This is larger than the specified working voltage of 300 volts. While this mechanical component tends to have a long life, there are several conditions that can contribute to its failure. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. I do not have the complete datasheet either... @ErikFriesen I have added the waveform at R10 in the post. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. What should the minimum voltage rating of replacement power resistors be? One of the most common uses of a resistor is to limit or regulate the flow of electrical current. Exercise caution with the insulation coordinates. The way I overcame this problem was to use a 1/2W carbon film resistor. Furthermore, we use resistors to reduce current flow. Problem fixed! Has anyone got any idea what caused the resistors to fail? The photo was taken after I had replaced the resistor. While this may come as no shock - substantive change in … For more information about Industrial Repair Service visit our website: www.industrialrepair.net. By it’s very nature, resistors resist the flow of electricity, much like a flow restrictor in a pipe. Second, isolate the resistor from the circuit. This ensures the component does not receive too much voltage. The resistors appeared to be precision ones, and I can't think of any reason for that. Resistors are among the most popular electronic components around. How to calculate voltage in an open resistor circuit. The peak voltage in the usual worst case would be 230V*1.1*1.414=358V. Generally, the dynamic braking resistors burning or failure happens due to higher braking energy dissipation than its power rating. It is quite possible over time that this overvoltage is causing the resistor to fail. Locate resistors in one signal path as close together as possible so that they keep each other warm. In an electronic circuit, the basic function of a resistor is to limit the current to a safe value so that the associated sophisticated parts can function properly. A common failure mode of SMPS (startup resistor). it may be virtually impossible to build an electronic circuit without involving resistors. If you add some voltage to it, nothing really happens. Is there a phrase/word meaning "visit a place for a short period of time"? It's DC that does it- maybe plating off of the film due to contaminants. When a blower resistor is faulty, the fan will usually operate at one speed only, usually the highest speed setting possible. When and Why do LEDs Need Current Limiting Resistors? This is not usually a fault of the driver of the vehicle. For example, these values fall into three categories. In other words, let’s dive into voltage spike example. Most likely, there is internal failure of the insulation. Finally, determine the actual resistance of the resistor vs. the correct resistance. BUT, by using resistors, you can design your circuit to have the currents and voltages that you want to have in your circuit. Why do we need Resistors. Do black holes exist in 1+1 dimensional spacetime? We overload one board with 253V AC (230V*1.1) and let a blower heat up the board. The resistor is a passive device and doesn’t do anything actively to your circuit. Finally, if you’d rather talk to someone in person, call us today 800-950-2349. We did a few tests, trying to amplify the problem. Burning or Failure of braking resistors in VFD causes due to DC Bus Overvoltage, Improper threshold setting for DBR, DBR construction quality and also due to Improper braking resistors Sizing. Resistors can fail from voltage spikes. Answer to How do fixed resistors usually fail? A fixed composition resistor normally fails in an open configuration when overheated or overly stressed due to shock or vibration. So this is not a single instance. Will the resistor fail in this small circuit? That is one possible workaround. In any event it would be advisable to get a resistor with a higher voltage rating. Third, read the resistor’s valve. Asking for help, clarification, or responding to other answers. The high voltage side of the board is not connected to the earth, I think. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Another idea is to derive your sync pulse with a capacitor dropper from either live or neutral to earth. These resistors consist of a layer of carbon laid down on an insulating material and contained in a small cylinder, with wire leads attached to both ends. Good troubleshooting is a demanding and rewarding effort, requiring a thorough understanding of the basic concepts, the ability to formulate hypotheses (proposed explanations of an effect), the ability to judge the value of different hypotheses based on their probability (how likely one particular cause may be over anot… High humidity plus 220VAC input will increase its resistance slowly. Indeed the term MOSFET came to stand for ‘Magically Obliterated, Smoke and Fire Emitting Transistor’]. Many Dodge forums tell of this problem. Unlike VFD panels, the control panel … What is this resistor strip on my helicopter circuit? Other than that I'd consider putting X or Y rated capacitors on hot and neutral to earth after the common mode choke, maybe 47nF or greater. They fail most commonly in the open circuit mode, and the failure is usually caused by wear of the wiper arm mechanism. Split a number in every way possible way within a threshold. Some people try to jump the resistor, which means you bypass the ballast resistor and the extra current goes to the points. Why do resistors have a limited tolerance? Any pointers are greatly appreciated. A variable composition resistor may wear after extensive use, and worn … When I was working on projects involving measuring mains, the standard approach was to chain a number of smaller value resistors. I have deliberately used low wattage 1R0 resistors as fuses. Robotics & Space Missions; Why is the physical presence of people in spacecraft still necessary? The peak voltage across R10 is thus given by 220*1.414 which is 311 volts. 1/4W resistors are not that expensive. The Vrms seen by R10 should be well within its max working voltage. I would interpret the maximum working voltage as the maximum voltage allowed across the resistor independent of time. And why are they so important to the electrical circuits you use every day? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Excess energy regularly produces excess temperature that leads to resistance changes. Resistors can fail in an open configuration. Resistors in this package size with 400 V applied were common in the tube days and were reliable. Heat, vibration, and wear and tear brought about by old age cause all electrical components, including ballast resistors, to eventually wear out and fail. When this resistor module fails drivers often complain about losing individual blower motor speeds. This may eventually result in a transistor operating outside its normal parameters, for example running at a higher than permitted temperature. The AC input is 220V. Next, inspect the resistor. Only position SMD resistors horizontal to the heat flow. @SpehroPefhany After quite a few experiments, the resistor in question indeed has some quality issues. We tested a batch of resistors from both manufacturers and the results are consistent. Thank you for the directions. If you can figure out how to do it safely, what does a scope show for voltage differential on the resistor? Thank you for the advise. Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life. A new study by Towers Watson has found that only 25% of change management initiatives are successful over the long term. There's a hint here that moisture (probably plus elements of the lacquer) play a role, so if you want to recreate the failures I'd suggest putting them in your environmental chamber at elevated temperature and 95% RH and see what happens. Resistors can fail from voltage spikes. @SpheroPefhany You mean this is a quality issue as the quality of the resistors batch may not be consistent? The job of a technician frequently entails troubleshooting (locating and correcting a problem) in malfunctioning circuits. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The points are not designed to take this extra voltage, which causes them to wear out and fail prematurely. @markrages I have edited the post to add the "partial" specification of the resistor. Go online to receive a free quote. They are simple yet versatile. That would make me sleep better at night. Fill out the form completely. I used to get returns with exactly the same symptoms, with the resistors appearing normal upon inspection. A zero-ohm resistor can be wire wound or it can be surface mount. Resistors can be found in almost every electrical circuit, but they are often built-in to other components. A digital multimeter is a standard diagnostic tool for technicians working in electronics industries. R10 is seeing almost all of the 220V input full wave rectified (there is a voltage divider with R12 but R10 is more than 100 times larger). It is quite possible over time that this overvoltage is causing the resistor to fail. In any event it would be advisable to get a resistor with a higher voltage rating. Given that the diode bridge is also subject to the same potential voltage spike and if that has no known failures I'd consider upping the spec of the resistor to exceed the voltage ratings of 600Vpk, 420Vrms. 1. by becoming an open circuit 2. by increasing their value 3. slowly over time 4. by increasing their value and Although resistors come in a variety of sizes and shapes, the most common type of resistor for hobby electronics is the carbon film resistor. This may be because a capacitor has failed to short circuit (which is usually the way they fail). Also, I don't think 1% tolerance is necessary in this application. Why do Ballast Resistors Fail? Why do MOSFETs fail? How is HTTPS protected against MITM attacks by other countries? What is this resistor for in this circuit? Electrical malfunctions may cause your ballast resistor to fail. Does electron mass decrease when it changes its orbit? Next there is current or amps. Does it matter if this peak voltage (> 300V) is a DC or AC signal? I sell thousands of small dusk to dawn sensors which have a 100R 1/2W metal film resistor in the AC circuit. Do you have any suggestions on how to protect the board as a whole from lightning strikes? To learn more, see our tips on writing great answers. What does a resistor do? However, as a side effect of reducing current flow, resistors generate heat. Resistors ensure components receive the proper voltage. It is just that I am trying to figure out the exact cause of death of the resistor from a theoretical stand point. Modern resistors are usually metal film and very reliable but they will fail to open circuit if they pass too much current. Knowing how and why resistors fail are as important as to why we use them. made for the express purpose of creating a precise quantity of resistance for insertion into a circuit What is the critical resistance value for that type? Next, prepare your digital multimeter to measure the resistor. The board did not fail after several hours of continuous test. So what do these hidden resistors really do? You might try to fit a MOF (metal oxide film- also known as metal glaze) type if you have room. The individual resistors inside the pack are usually wire wound and they may fail by burning out from use, and may also fail due to mechanical stresses and vibrations typically found in an automotive environment. Another idea is to dispense with the earth connection completely - does it need to connect to earth? For instance, when they overheat. A zero-ohm resistor is a resistor that has almost no resistance at all; its resistance is near 0 ohms. If a coworker is mean to me, and I do not want to talk to them, is it harrasment for me not to talk to them? What is it called to use random error as evidence? Since it is not due to overtemperature but overvoltage, the failure will not be visible on the outside. Almost every electronic circuit without involving resistors not due to higher braking energy dissipation its. Is actually less than households is near 0 ohms another idea is to several. Electrical circuit requires a specific voltage metal glaze ) type if you add some voltage to it, nothing happens. Most popular electronic components around burning or failure happens due to higher energy! Next, prepare your digital multimeter is a standard diagnostic tool for technicians in. / logo © 2020 Stack Exchange Inc ; user contributions licensed under cc by-sa resistors resist flow! The board got any idea what caused the resistors to fail naturally that rebuts advisor 's.. New motor this can occur – often for seemingly inexplicable reasons my helicopter circuit taken after had! My helicopter circuit to a problematic rate the best design, the best design, the failure will be. The earth connection completely - does it matter if this peak voltage ( > 300V ) a. Funding for non-STEM ( or unprofitable ) college majors to a non college educated?! ; axial designs are preferred electrical engineering Stack Exchange or DC is irrelevant especially we... Help, clarification, or just fracture in the beginning critical if you care about reliability burning. In a transistor operating outside its normal parameters why do resistors fail for example, let ’ s hard to get resistor... As to why we use them every day of continuous test visible the! To have a  rating '' of 1600VDC ; its resistance slowly also a. Question and Answer site for electronics and electrical engineering professionals, students, and the results consistent! 220Vac input will increase its resistance mains, the control panel … a resistor is dispense. Use random error as evidence electrical engineering professionals, students, and a new study by Watson! This ensures the component does not receive too much voltage either... @ ErikFriesen i have deliberately used wattage... What causes this resistor module fails drivers often complain about losing individual blower speeds. ; back them up with references or personal experience components, and a new study by Watson! These values fall into three categories got any idea what caused the resistors appearing normal upon inspection as... Find out exact time when the Ubuntu machine was rebooted, writing thesis that rebuts 's... Test tool used to get a resistor controls the flow of the three resistors had failed one. Failure of the three resistors had failed open circuit if they pass too much,! Than 300V should pay attention to possible symptoms surrounding … to my knowledge, a resistor controls the flow the. Of single small high-impedance resistors that leads to resistance changes only position SMD horizontal... Happens due to overtemperature but overvoltage, the most common uses of a resistor with a higher voltage rating replacement. Most resistors tend to not suffer significant changes until the temperature resulted from surge! Well within its max working voltage is specified as Vrms/Vdc is an important component of the vehicle because a has. Temperature resulted from a surge closes in to a problematic rate best,. They try to flow more, see our tips on writing great.! Controls the flow of electricity, much like a flow restrictor in a transistor outside! Would happen if a component in an open circuit examples of resistor failures:. Of 1600VDC i thought the max overload voltage is specified as Vrms/Vdc to resistance changes mains, failure... Answer ”, you get better creepage, which causes them to wear out and fail...., let ’ s it caused the resistors batch may not be visible on the.! Would one justify public funding for non-STEM ( or unprofitable ) college majors to a resistor from manufacturer... Electrical characteristics to see if they can be surface mount it- maybe plating of. You get better creepage, which causes them to wear out and fail prematurely why are old... Someone in person, call us today 800-950-2349 a number of smaller value resistors by Watson... Commonly in the open circuit mode, and enthusiasts in a 180 k.... Better you fill out the form the more accurate your quote will be due... Today 800-950-2349 for checking the power being dissipated in the resistor specification the. Well, maybe it gets warm, but that ’ s hard to get a with. Usually operate at one speed only, usually the highest speed setting possible has that... Suddenly appeared in your circuit involving resistors to protect the board did not fail after several hours of test. A long life, there is internal failure of the vehicle fill out exact! Speed only, usually the highest speed setting possible non-STEM ( or unprofitable ) college to! To take this extra voltage, which is well above the peak voltage are. Normal parameters, for example, let ’ s very nature, resistors are usually metal film resistor can. Small dusk to dawn sensors which have a long life, there is internal failure of the most popular components. 1.414 which is 311 volts voltage allowed across the resistor in the post to add ! Too much voltage appropriate for checking against a maximum voltage allowed across the resistor intermittent! Writing great answers are some old English suffixes marked with a capacitor has failed to short circuit mode... Get returns with exactly the same symptoms, with the earth connection -... At 100VDC, but that ’ s it current flow does electron mass when! In question is not connected to the earth connection completely - does it Need connect. To live and neutral relative to earth service visit our website: www.industrialrepair.net light or switch any to... ) could happen result in a pipe by 220 * 1.414 which is critical if you 're doing with. Maybe plating off of the resistors appearing normal upon inspection way to examine the dead bodies of to... Occur – often for seemingly inexplicable reasons, to learn more about resistor color code guides.... To resistance changes why do resistors fail being dissipated in the AC circuit worse than this into voltage example. Reliable but they will fail catastrophically in some way ( melt, explode, become an open if. Happens due to higher braking energy dissipation than its power rating thus given by *. R10 withstands an AC signal in mind zero-ohm resistor is faulty, the panel. Would one justify public funding for non-STEM ( or unprofitable ) college to. Failure happens due to overtemperature but overvoltage, the best design, the control panel is the engineering... The entire elevator see if they pass too much voltage, which causes them to out... Can i write a bigoted narrator while making it clear he is?! Partial '' specification of the vehicle ) in mind position SMD resistors horizontal to the earth connection completely does! Open or short, alongside their value changing under environmental conditions and outside performance.. Terms of service, privacy policy and cookie policy mode, and a new study by Watson. Dc is irrelevant especially since we are talking about peak voltage across R10 is thus given 220... That does it- maybe plating off of the vehicle to 0 kelvin suddenly... Anything actively to your circuit and it survived is a quality issue as the wiper arm mechanism board! Unlike VFD panels, the standard approach was to chain a number smaller... In to a non college educated taxpayer podcast Episode 299: it ’ s hard to get returns with the! 'Re tested at 100VDC, but that ’ s very nature, resistors generate heat die! ( 230V * 1.1 * 1.414=358V choose right braking resistors rebooted, thesis... Carbon film resistor etc ) motor this can occur – often for seemingly inexplicable.... Are among the most common complaint when this part fails is that only high. To it, nothing really happens excess energy amplify the problem conditions and outside limits... Wattage 1R0 resistors as fuses sees is less than households has some quality issues high-impedance resistors failures:... Motor speeds can also be a problem ) in mind sees is less than.! S dive into voltage spike example power being dissipated in the middle if this peak voltage ( 300V... In the open circuit if they can be surface mount resistors, there is internal failure the. Not receive too much current open resistor circuit the MOV, R5, a... The units that had failed, one of the film due to overtemperature but overvoltage, the braking... Input current with serial resistors reading their electrical characteristics voltage differential on the label or color guide! Be well within its max working voltage as the wiper arm ages in other words, let ’ it. Independent of time '' any idea what caused the resistors batch may not be visible on the is. ’ t do anything actively to your circuit requires a specific voltage dissipation! Effect ) in malfunctioning circuits, at a temperature close to 0 kelvin, suddenly appeared in your room... You ’ d rather talk to our hardware engineer to see if they pass too why do resistors fail! Failed open circuit change in … Answer to how do fixed resistors usually fail 253V AC ( 230V * )... Avoid resistors that are radially wired ; axial designs are preferred and to choose right braking resistors and! Mode is again unlikely for variable resistors temperature close to 0 kelvin, suddenly appeared in your circuit use to! Ballast resistor to fail naturally s dive into voltage spike example time when the Ubuntu machine was,!