Question

An electric bulb of 50 W is used for 5 hours. Calculate the energy consumed by the bulb.​

• A. $9\times {10}^{6}J$
• B. 9 kJ​
• C. 90 kJ​
• D. $9\times {10}^{5}J$

Answer 1

The correct option is D $9\times {10}^{5}J$

Given, P = 50 W
t = 5 hrs = 5 x 3600 s
We know that
E = Pt
E = 50 W x 5 x 3600 s = $9\times {10}^{5}J$