Question

A current of $0.5A$ flows through a resistance of $10\Omega$ for $\frac{1}{2}$ hour. Find the amount of electrical energy consumed by resistance.

• A. $450J$
• B. $4500J$
• C. $45J$
• D. $45000J$

Answer 1

The correct option is B $4500J$

Given:

Current flowing through the resistor $I=0.5A$

Resistance $R=10\Omega$

Time for which current flows, $t=\frac{1}{2}hr=30min=30\times 60s=1800s$

By Joule's law of heating, energy consumed by the resistance,

$E=I^{2}RT={\left(0.5\right)}^2\times 10\times 1800$

$=4500J$