First slide

voltmeter

Question

$50 Ω a n d 100 Ω$ resistors are connected in series. This connection is connected with a battery of 2.4 volts. When a voltmeter of $100 Ω$ resistance is connected across $100 Ω$ resistor, then the reading of the voltmeter will be

Easy

A

1.6 V
B

1.0 V
C

1.2 V
D

2.0 V

Solution

Equivalent resistance of the circuit, $R_{e q} = 100 Ω$
Current through the circuit, $i = \frac{2.4}{100} A$
Potential difference across combination of voltmeter and $100 Ω$ resistance $R = \frac{2.4}{100} \times 50 = 1.2 V$
Since the voltmeter and $100 Ω$ resistance are in parallel, so the voltmeter reads the same value i.e., 1.2V.

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