Timeline for Question about ohmic conductors

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May 13, 2015 at 20:53	comment	added	Floris		Good answer. Small point: because resistance of ohmic resistors is typically a function of temperature, they will exhibit a small non-linear effect (the resistance measured with 10 V will not be the same as the resistance measured with 1 V, because the device was heated by the additional current). But in practice we ignore this because implicitly we assume "at constant temperature". You more or less said that, I just wanted to emphasize it.
May 13, 2015 at 20:33	vote	accept	user45220
May 13, 2015 at 20:32	comment	added	steve		Metallic conductors heat up.Their resistance is higher when they are hotter. But they are ohmic because the Resistance measured with 1Volt is the same as the resistance measured with 10 volts. However if you measured with 1 volt when it was 20 Celsius, and measured at 1 Volt when it was 200 Celcius, you would have 2 different resistances
May 13, 2015 at 20:28	comment	added	user45220		Thanks. So how do we explain metallic conductors? They are always ohmic according to my textbook. Does that mean they NEVER heat up no matter how much current we put through them?
May 13, 2015 at 20:25	comment	added	steve		Yes ohmic conductors resistances will change with in increase in temperature. But the resistance will not change if the temperature is kept constant, the actual temperature it is at is not important. Its important to remember that nothing is perfect, and most materials have a range in which they are ohmic, meaning voltage and current go up linearly together.
May 13, 2015 at 20:18	comment	added	user45220		"however, being ohmic and not ohmic is not the reason": Does that mean that the resistance of an ohmic conductors can change if the temperature increases? Thanks!
May 13, 2015 at 20:11	history	answered	steve	CC BY-SA 3.0