The potential difference required to pass a current of 0.2 A through a wire of resistance 20 Ω is:
100 V
4 V
0.01 V
40 V
We know that, V = IR = 0.2 A × 20 Ω= 4 V
Find the potential difference required to flow a current of 200 mA in a wire of resistance 20 ohm.
Calculate the current flowing through a wire of resistance 7.5 Ω connected to a battery of potential difference 1.5 V.