Direction: —A moving coil instrument gives full scale deflection for a current of 1 mA and voltage across if of 100 mv. In order to convert it to.
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An ammeter giving full scale deflection of 1000A. The required value of shunt resistance:
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- 1Ω
- 10Ω
- 0·1mΩ
- 1mΩ
- 1Ω
Correct Option: C
Given, full scale deflection of ImA and voltage across 100 mV.
So, meter resistance,
| Rm = | = 100Ω | |
| 1mA |
In this case the shunt resistance can be connected as shown below—
For 1000A, current through Rsh = 1000 – 0·001 = 999·99A
| Rsh = | ≈ 0·1mΩ | |
| 999·99 |
