Why does high resistance in a circuit produce more heat?

Answer 1

On the contrary, for a given voltage, lowering the resistance will increment the current and the power dissipated by the resistor. hence heating up the resistor.

For a higher resistance value, you will need to increment the current by incrementing the voltage to increment the power dissipated.

Answer 2

Resistors heat up for the same reason that any device that uses energy heats up.

If you pass current (amperes) through a resistor, the power across that resistor (watts) is voltage times current. That power must go someplace, so it makes heat.

Answer 3

Heat produced due to resistance is given by the expression Q = i^2 R t

i is the current flowing through, R is the resistance value and t is the time of flow of current.

So heat produced is directly proportional to the resistance value.

Hence higher the resistance value more the heat produced

Answer 4

This is only the case for insulators. An increase in temperature imparts energy into the material, releasing free electrons from the atoms' valence orbitals. An increase in the number of free electrons essentially makes the material a better conductor, thus reducing its resistance. However, this usually happens only at extremely high temperatures, far beyond those encountered in normal operations.

For electrical conductors, the reverse is true, because thermal energy makes all the particles vibrate more, so the free electrons collide more frequently with the lattice atoms and flow less freely.

Answer 5

Because resistance have positive temprature coefficient.

So with increase in temprature it increases