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Question

# In the circuits shown below the ammeter A reads 4 amp. and the voltmeter V reads 20 volts. The value of the resistance R is

A
Slightly more than 5 ohms
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B
Slightly less than 5 ohms
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C
Exactly 5 ohms
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D
None of the above
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Solution

## The correct option is A Slightly more than 5 ohmsAccording to the given circuit diagram voltage drop across the resistance is 20 volts, but the current passing through the resistance won't be 4 amp as the given voltmeter and ammeter are not ideal. Hence some current will also flow through the voltmeter.therefore, [R=V/i] will give resistance to be greater than 5 ohm as current (i) through the resistance is less than 4 amp

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