# Measurements

### Explanation of question 12

A moving coil multimeter of sensitivity 2000/V is set to ‘DC 20V’, and connected across terminals A and B in Fig. 23.1. The reading on the multimeter will be

1. 20V
2. 15V
3. 10V
4. 12V

The answer is :- 3 On the 20 V setting the instrument will have a resistance of 200 x 20 = 40000 . When the instrument is connected across terminals A and B the circuit will become

Since the two 40k resistors in parallel is equivalent to one 20k resistor, we have

Thus only one third of the supply voltage (10V) will appear across A-B

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