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A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be:

1. 0.001
2. 0.01
3. 1
4. 0.05

Correct answer: 0.001

Solution

To convert the milli voltmeter into an ammeter, the shunt resistance is calculated using the formula Rs = V/I, where V is the voltage range (25 mV = 0.025 V) and I is the current range (25 A). Substituting, Rs = 0.025/25 = 0.001 ohm.

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