Question

An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?

• A. $40W$
• B. $60W$
• C. $50W$
• D. $70W$

Answer 1

The correct option is B $60W$

Given, energy E$=7.2kJ=7.2\times {10}^{3}J$ and time t$=2minutes=2\times 60=120s$.
We know, power, $P=\frac{EnergyorWork}{t}=\frac{7.2\times {10}^3}{120}=60W$.
$\therefore$ The power of electric bulb is $60W$.