# Measurements

### Explanation of question 9

A moving coil instrument has an f.s.d. of 10mA and a resistance of 20. The value of multiplier resistance required to enable the instrument to read up to 12V will be

1. 1220
2. 1200
3. 1180
4. 18.8

The answer is :- 3

For fsd a current of 10mA will flow. Thus total resistance of the circuit = 12V / 10mA = 12/0.01 = 1200. If the meter's resistance is 20, then the resistance of the shunt must be 1200 - 20 = 1180

BACK

page (tq2309ex)
Some material Copyright John Bowyer G4KGS.
Click here for important Copyright information
Web Space provided by Hostroute.com Ltd
Contact details