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Question

In the circuit shown, the readings of ammeter and voltmeter are 4A and 20V respectively. The meters are non ideal, then R is:

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A
5 Ω
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B
greater than 5 Ω
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C
Less than 5 Ω
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D
between 4 Ω and 5 Ω
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Solution

The correct option is B greater than 5 Ω
Ammeter gives reading 4A, and both ammeter and voltmeter is not ideal, Thus voltmeter draws extra current say x
So, According to Kirchoff's law the current passing through resistance would be 4x therefore, resistance R=20(4x)

where x>0 So R>5

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