# Resistors in series and parallel; power

### Explanation of question 7

If the circuit in Fig. 3.1 (as in the previous problem), is connected across a 40V supply , the current in the 15 resistor will be

1. 0.8A, the same as the current in the 10 resistor
2. 0.8A, but different from the current in the 10 resistor
3. 1.2A, but different from the current in the 10 resistor
4. 1.2A, the same as the current in the 10 resistor

The answer is :- 2

P.D. across 15 resistor = 12 V,

so the current through 15 resistor = 12 / 15 = 0.8A.

Current through 10 resistor will be 12 / 10 = 1.2 A.

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