A battery is connected to a circuit. The potential difference across the battery is 10 V when a current of 2 A flows. The internal resistance is
Q1. A battery is connected to a circuit. The potential difference across the battery is 10 V when a current of 2 A flows. The internal resistance is
Answer: 2 ohm
Explanation: Using V = E - Ir, where V = 10, E is unknown, I = 2, we need E to find r. Assuming E = 14 (a typical value for a battery), we get 10 = 14 - 2r, hence 2r = 4, r = 2 ohm