Q. How many calories of heat will be produced approximately in a 210 W electric bulb in 5 min?
A) 80000 cal
B) 63000 cal
C) 1050 cal
D) 15000 cal
Explanation
(d) Heat developed by 210 W electric bulb in 5 min is given by
$H = \frac{W}{J} = \frac{210 \times 5 \times 60}{4.2} = 15000\ cal$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.