Question

An electric heater of resistance $100\Omega$ is connected to a main supply for 20 minutes. If 2A current flows through the filament of the heater, calculate the heat energy produced in the heater.

• A. $4.8\times {10}^{5}J$
• B. $400J$
• C. $626J$
• D. $357J$

Answer 1

The correct option is A $4.8\times {10}^{5}J$

Given : $R=100\Omega$ $t=20\times 60=1200$ s $I=2$ A

$\therefore$ Heat energy produced $H=I^{2}Rt=2^2\times 100\times 1200=4.8\times {10}^5$ J