# Resistors in series and parallel; power

### Explanation of question 5

In Fig. 3.1, the equivalent resistance between A and B will be

1. 8
2. 11
3. 20
4. 39

The answer is :- 3

In a series-parallel combination, evaluate the parallel combination first. Equivalent resistance of the parallel combination is:

10 x 15
10+15

= 150 / 25 = 6

Therefore, total resistance between A and B = 14 + 6 = 20

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