What is the value displayed by the voltmeter in the given picture?

F1 U.B Deepak 20.03.2020 D 1

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. 1 A
  2. 4 V
  3. 4 A
  4. 1 V

Answer (Detailed Solution Below)

Option 4 : 1 V
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Detailed Solution

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Concept:

Let the given voltmeter is ideal so that resistance of voltmeter is infinity.

Now by applying the Voltage division rule in the circuit diagram given in the question.

F1 Shraddha Uday 24.12.2020 D2

\(V_1=\frac{R_1}{R_1+R_2}\times V\)

\(V_2=\frac{R_2}{R_1+R_2}\times V\)

V= voltage across R1 resistance

V2 = voltage across R2 reistance

V = Total voltage

Calculation:

Given: V = 5 V

F1 Shraddha Uday 24.12.2020 D3

So, voltage across 1kΩ is,

\(V_1=\frac{R_1}{R_1+R_2}\times V\)

\(V_2=~\frac{1}{1\; +\; 4}\times5=1~V\)

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