A voltmeter of resistance 400 is utilized to measure the potential difference across a 100 resistor in a circuit consisting of an 84 V battery connected in series with the 100 resistor and a 200 resistor. Calculate the

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Quantrex Academy · Accepted Answer

Correct answer: C. 28 V

Before the voltmeter is connected, the circuit consists of the

100\text{ }\Omega

and

200\text{ }\Omega

resistors in series with the

84\text{ V}

battery.

Total resistance of the circuit is:

R_{eq} = 100 + 200 = 300\text{ }\Omega

Current flowing through the circuit is:

I = \dfrac{V}{R_{eq}} = \dfrac{84}{300}\text{ A}

The potential difference across the

100\text{ }\Omega

resistor is:

V_{100} = I \times 100 = \dfrac{84}{300} \times 100 = 28\text{ V}

A voltmeter of resistance 400 is utilized to measure the potential...

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