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NDA 2023
Exam
NDA
Year
2023
Subject
General Ability
Chapter
General Science

NDA 2023 · General Ability · General Science

The potential difference between the two end terminals of an...

The potential difference between the two end terminals of an electric heater is 220 V and the current through it is 0.5 A. What would be the current through the heater if the potential difference across the terminals of the heater is reduced to 120 V?

Options

  1. A1.0 A
  2. B0.5 A
  3. C0.27A
  4. D0.7A

Correct answer

C. 0.27A

Step-by-step solution

We know that V=IR\mathrm{V}=\mathrm{IR}, Resistance of the heater remain same so R1=R2R_1=R_2 Given v1=220\mathrm{v}_1=220 volt V2=120\mathrm{V}_2=120 volt I1=0.5AI2=?R1=R2V1/I1=V2/I2220/0.5=120/I2I2=0.27A\begin{aligned} & \mathrm{I}_1=0.5 \mathrm{ A} \\ & \mathrm{I}_2=? \\ & \mathrm{R}_1=\mathrm{R}_2 \\ & \mathrm{ V}_1 / \mathrm{I}_1=\mathrm{V}_2 / \mathrm{I}_2 \\ & 220 / 0.5=120 / \mathrm{I}_2 \\ & \mathrm{I}_2=0.27 \mathrm{ A} \end{aligned}
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