# Resistors in series and parallel; power

### Explanation of question 2

Two resistors, each of resistance value 5.6k, are connected in parallel. An equivalent resistor will have a value of

1. 2.8k
2. 5.6k
3. 11.2k
4. 22.4k

The answer is :- 1

1 / R = 1 / 5.6 + 1 / 5.6, where R is in kilohms.

Using reciprocals on a calculator gives 2.8 k.

Alternatively, R = R1R2 / (R1 + R2) = (5.6 x 5.6) / (5.6 + 5.6) k

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