An electric room heater draws a current of 2.4 A from the $120 \mathrm{~V}$ supply line. What current will this room heater draw when connected to $240 \mathrm{~V}$ supply line?

Academic Physics NCERT Class 10

Case{i}

Given: $\mathrm{I}=2.4 \mathrm{amp}, \mathrm{V}=120 \mathrm{volt}$

According to ohm's law:

$R = \frac{V}{I}$

$\mathrm{R}=\frac{120}{2.4}=50 \mathrm{ohm}$

Case{ii}

Given: $\mathrm{V}=240$ volt

$\mathrm{R}=50 \mathrm{ohm}$

According to ohm's law:

$\mathrm{I}=\frac{\mathrm{V}}{\mathrm{R}}$

Current drawn will be:

$\mathrm{I}=\frac{\mathrm{240}}{\mathrm{50}}$

$\mathrm{I}=4.8 \mathrm{amp}$

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Updated on: 10-Oct-2022

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