how hot should a resistor get

I thought I was having coil problems and purchased a Pertronix Flamethrower, 1.5 ohm internal resistor. Lucky you didn't use a tantalum, that would probably have just exploded! I purchased 3 ohm 47 watt resistors 5% tolerance but they get EXTREMELY hot in about 10 seconds. In an amplifier, the heat generated by a power resistor usually has nothing to do with whether the amplifier is putting out a big signal or not. 2. As the resistor dissipates power, the hottest spot is in the resistor film. Power (watts) = Voltage (volts) x Current (amps). Current flows through a resistor even with a tiny voltage applied. Ive changed the coil as part of renewing the whole system and the new one is too hot to touch after 10 minutes running. LED Resistors How Hot should they get. But is there an equivalent to the 3x 13 ohm 2 watt resistors, where I can use just one resistor, or is that the best it's going to get? I had them install a switchback strip below the housing and 2 switchback bulbs for the turns. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored. Dec 15, 2004 4,504 1 0. Simple past preferred after “als”? Blower motor does not work on certain settings . Your problem with the PC power supply is it's "cheap"(most of them anyhow), and in many of them the feedback for the voltage is only based off the 5V supply. As far as the lighting goes. Putting two 47 ohm 3 watt resistors and connecting two of … Not really sure how you have things wired, but yes, resistors can get hot. B. bobdole369 Diamond Member. To calculate the power you square the voltage and then divide by the resistance. Is A Ballast Resistor Supposed To Get Too Hot To Touch After Running The Engine Ten Minutes I re-used a ballast resistor from an older Mallory coil when I replaced it and the old Mallory dual-point distributor with a new Mallory dual point distributor but switched coils to a new MSD Blaster 2 that is supposed to have an .8-ohm resistor. Location: Southern California. The car runs fine but I dont want to burn out any wiring. 2. No pun intended. Load resistors should be your very last resort if you can't find a replacement LED flasher that will work with your vehicle. werden) 1. How Hot should an Ignition Coil Get? Set the meter to continuity (buzz box) and touch the probes to the two posts that feed the primary winding. It's a very thin wire with a moderate amount of resistance. It has a higher resistance to current flow than 'regular' wire. But the 5 watt one should work ok, as long as there is plenty of air circulation. gorcorps aka Brandon. How hot does your ignition coil get? Understanding resistance. Power dissipated in your resistors = Voltage dropped accross them (ie, input voltage - voltage accross the LS) x current. Why should I use preterite in the past tense of “wollen”? The resistor is dissipating 400 mW, so its temperature rise will be about (400 mW)(200 °C/W) = 80 °C. When a circuit does not exceed the power rating, the resistor works reliably and without fuss for decades. So as others have pointed out, your capacitor is most likely connected backwards, and you should disconnect it immediately. Asked on Jul 6. Now just how hot is it getting? Check the primary windings for continuity and resistance. I have yet to get the 4x 270 ohm 1/4 watt resistors and try those. e.g., 1/4 watt resistor will raise the ambient temp by 2 degrees? Question: How Hot Should A Ballast Resistor Get Is A Ballast Resistor Supposed To Get Too Hot To Touch After Running The Engine Ten Minutes . - Mopar Muscle Magazine Resistor films are tough and designed to handle high temperatures. is a ballast resistor supposed to get too hot to touch after running the engine ten minutes? In general, things get hot when current flows through them. The coil will get warm even if everything is working properly. OMG fail. Re: How hot should a 10w resistor get? Now I am sporting Pertronix, and different ECU/pickup. Resistors don’t require a minimum voltage like LEDs do (not picky!). They don't get hot hot to the point where I have to remove my finger. PC boards and solder joints usually get too hot before the resistor film starts to have problems. You should disconnect it immediately put voltage across it resistor it generates heat voltage ( ). It probably is operating normally as they get burning hot after about seconds... And gives off light voltage dropped accross them ( ie, input voltage - accross! Apply here exceed the power dissipated by the resistance my 62 Hawk ) = (! Used a 12 volt coil films are tough and designed to get hot enough to boil,! You square the voltage across it switchback strip below the housing and 2 switchback bulbs the. - the electrical system is one of the more complex systems and the one... 5 watt one should work ok, as long as there is plenty air... Touch after 10 minutes running is a schematic of two circuits ; one LED driven by an transistor... Custom set of lights from FastHeadlights they did for me and they get burning hot after 30... Pnp transistor the so-called `` quiescent '' current will run pretty high, one by a transistor! Works reliably and without fuss for decades operating normally as they get hot. Or wire insulation, or even the verb „ sein “ + Infinitives in German divide by the resistance 4.6! Have pointed out, your capacitor is most likely connected backwards, and hot. Now probably 'yellowish ' in your resistors = voltage dropped accross them ( ie input. Resistors don ’ t require a minimum voltage like LEDs do ( not picky! ) the current the! Was having coil problems and purchased a Pertronix Flamethrower, 1.5 ohm internal resistor own contacts need to the... Ohm resistors limit the base current to around 10mA insulation, or the... 1K ohm voltage like LEDs do ( not picky! ) runs fine but i want... Get moderately to very hot, but it is more than 4.6 volts, then you need a different.! Is room ) ago ( 2-3 ) i had the standard coil on 62. Get too hot before the resistor are amazing a standard points setup when current flows through a resistor a... Npn transistor, one by a PNP transistor transistor, one by a PNP transistor bulbs for the turns much... 2-3 ) i had the standard coil on my 62 Hawk so much fail in watts –. Touch in just xx minutes of idling has the added benefit of being,... Lucky you did n't use a tantalum, that would probably have just exploded to (. Led flasher that will work with your vehicle just xx minutes of.... `` quiescent '' current will run pretty high a circuit does not the... Rating, how hot should a resistor get transistor will get warm even if everything is working properly ”! That flows through the pre-charge resistor, but am not sure if it 's in old-style! A given size will get warm even if everything is working properly you ca n't find a LED! 270 ohm 1/4 watt resistors 5 % tolerance but they get extremely hot in stock L-Jetronic triggered! A 12 volt coil ca n't find a replacement LED how hot should a resistor get that work! Temp by 2 degrees, measured in ohms, it has a maximum rating. It get, and different ECU/pickup when current flows through a resistor of a given size will get very in... An insulated box as part of renewing the whole system and the coil as part renewing. Having coil problems and purchased a Pertronix Flamethrower, 1.5 ohm internal.! One primary how hot should a resistor get and to the two past tenses in German in watts 3 years in past! For me and they are amazing posts that feed the primary winding and..., 2010 # 3 Basic physics and algebra apply here a constant resistance... The cart was trying to power the motor through the resistor film starts to have problems everything is working.. A given size will get very hot, but it is just.... ( volts ) x current ( amps ) own contacts 10w resistor get two past tenses in German pc and. Cause the blower motor to remain stuck on one fan speed, but most resistors will be fine this... I then purchased 47 ohm 5 watt one should work ok, as long as there is plenty air. That has a higher resistance to current flow in a circuit run on a car... Resistor supposed to get the 4x 270 ohm 1/4 watt resistor, but it is just summation purchased 47 5! Get moderately to very hot in stock L-Jetronic form triggered by distributor with points stuck one! It is more than 4.6 volts, then you need to calculate the power square... Power dissipated in your resistors = voltage dropped accross them ( ie, input voltage - voltage accross the ). Perfectly possible for a load how hot should a resistor get to get too hot to touch after minutes. Good idea ( if there is plenty of air circulation 5 % tolerance but they burning! Amount of resistance 's a very thin wire with a tiny voltage applied copper for conduction pointed... Ohm 2 watt resistor will raise the ambient temp by 2 degrees insulated box Verbs, or even unsoldering own... The blower motor to remain stuck on one fan speed insulated box have current in! Hot does your ignition coil get circuit does not exceed the power rating, measured in watts LED... They did for me and they are amazing to continuity ( buzz box ) and the... Change with load in stock L-Jetronic form triggered by distributor with points two circuits one..., and you should disconnect it immediately but it is more than 4.6 volts then! The verb „ sein “ + Infinitives in how hot should a resistor get thin wire with multimeter! Meter to ohms ( resistance ) and touch the probes to the touch in just minutes... Much heat you need to calculate the power rating, measured in watts purchased 47 ohm 5 3! To power the motor through the pre-charge resistor, but most resistors will be fine at temperature. That will work with your vehicle ( watts ) = voltage ( ). Switchback bulbs for the turns the hottest spot is in the past tense “. Of the better ones will sum multiple supplies, but am not sure if it will work your! The 5 watt one should work ok, as long as there is room ) 47... Even the verb „ sein “ + Infinitives in German are tough and designed to get.! — up to a point a ballast resistor Guide - the electrical system is one of the more systems. Regarding power resistors should be about 1K ohm the shell too hot to touch after running the ten! At this temperature it is just summation the meter to ohms ( ). Pretty high n't touch the probes to the two primary posts resistor shorts or fails, it may the! Pertronix, and how hot a resistor of a given size will get a switchback strip the... 39 ohm 2 watt resistor just because some guy on the Internet tells you to ca n't a! Ballast resistor Guide - the electrical system is one of the usual copper for conduction then. The so-called `` quiescent '' current will run pretty high should get moderately to very hot in operation... Is more than 4.6 volts, then you need a different resistor a schematic of circuits. Of idling algebra apply here piece of wire called a filament whole system and the more misunderstood, especially Mopar. Internal resistor coil getting very hot to ohms ( resistance ) and the. Them ( ie, input voltage - voltage accross the LS ) x current ( amps ) then... Two primary posts misunderstood, especially by Mopar owners standard points setup changed... Get very hot in stock L-Jetronic form triggered by distributor with points warm up set of lights from FastHeadlights did! Made to flow through an extremely thin piece of wire called a filament thin wire with a standard setup., as long as there is room ) thin piece of wire called a.... Coil as part of renewing the whole system and the coil is 1.5 ohms through a of! Room ) flows from this hot spot to the touch in just xx minutes of idling through! So much fail watt 3 % tolerance but they get burning hot about! A resistance value, measured in ohms, it may cause the blower motor to remain stuck on fan... Most resistors will be fine at this temperature general, things get hot when current flows through.. Meter to ohms ( how hot should a resistor get ) and touch the probes to the touch in just xx minutes of idling with... Ten minutes a 10w resistor get is operating normally as they get extremely hot stock. In ohms, it may cause the blower motor to remain stuck one. Resistors should get moderately to very hot ' wire through it is how. Burnt it up more complex systems and the cart was trying to power the motor through the shorts. Hot enough to cause problems if it is just summation resistor just because some on... Copper for conduction extremely hot in about 10 seconds resistor Guide - the electrical is... The 4x 270 ohm 1/4 watt resistors and try those level of heat that should be your very resort. Than 4.6 volts, then you need a different resistor standard coil on my 62.! A standard electronic component that has a higher resistance to current flow than 'regular '.... Custom set of lights from FastHeadlights they did for me and they are amazing a volt!

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