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A(0– 50A) moving coil ammet er has a volt age dr op of 0.1V across its terminals at full scale deflection. The external shunt resistance (in milliohms) needed to extend its range to (0 – 500A) is ______.
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- 0.22 to 0.23
- 0.21
- 0.13
- 0.21 to 0.22
Correct Option: A
Voltage drop across its terminals at full scale deflection = 0.1 volt
450 × Rsh = 0.1
| Rsh = | = 0.22 mΩ | |
| 450 |
Required shunt resistance, Rsh = 0.22m Ω
