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?
Case{i}
Given: $\mathrm{I}=2.4 \mathrm{amp}, \mathrm{V}=120 \mathrm{volt}$
$R = \frac{V}{I}$
$\mathrm{R}=\frac{120}{2.4}=50 \mathrm{ohm}$
Case{ii}
Given: $\mathrm{V}=240$ volt
$\mathrm{R}=50 \mathrm{ohm}$
$\mathrm{I}=\frac{\mathrm{V}}{\mathrm{R}}$
Current drawn will be:
$\mathrm{I}=\frac{\mathrm{240}}{\mathrm{50}}$
$\mathrm{I}=4.8 \mathrm{amp}$
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