Question

You have a cylindrical 20 Ω carbon resistor (ρ=5x10^-5 Ω m) that is 1.0 cm long and has a cross section area of 0.1 mm². The resistor is connected to a 5 V battery.

Part 1: What is the resistance of the resistor if its area is doubled?

Part 2: By what factor does the power dissipated by the resistor change if the resistor length is halved and the battery voltage is doubled?

Part 3: By what factor does the current in the circuit change if the resistor length is doubled and the battery voltage is doubled?

Answer 1

1)

2)

3)