Question

Power of an electrical device is 200w If current flows through it for 20 sec calculate
a) Resistance of electrical device
b) Heat generated
c) If a potential source is 20V calculate electrical energy​

Answer 1

Explanation:

The power dissipated in a resistor is given by P = V2/R which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases.