# Current, voltage and resistance

### Explanation of question 10

A battery has an open-circuit voltage of 24V. When delivering a load current of 2A its terminal voltage falls to 20 V. The internal resistance of the battery is

1. 12
2. 10
3. 6
4. 2

The answer is :- 4

The difference between the open-circuit voltage and load voltage (24 V - 20 V = 4 V) will be across the internal resistance.

Current through internal resistance is 2 A,

therefore internal resistance = 4V / 2A = 2

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