Question

Does resistance in a circuit remain constant if the temperature changes?

Answer 1

No the resistance of a given circuit does not remain constant if the temperature of the circuit changes.

Step-by-step explanation:

The resistance of any resistor used in a circuit depends upon the temperature of that resistor. This can be mathematically represented as follows

`R(t)=R_(0)(1+\alpha \Delta t)`

Where,

R(t) is resistance of any resistor at temperature t

`R_(o)` is the resistance of the resistor at time of fabrication

α is temperature coefficient of resistivity it's value is different for different materials

This change in the resistance is the cumulative effect of:

1) Variation of resistivity with temperature

2) Change in dimensions of the resistor with change in temperature