A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated
A
320J
B
400J
C
10800J
D
72000J
Verified Correct Answer: D.
Physical Principles & Numerical Solution
W = P x t
= 40 x 30 x 60
= 72000J
Source: Myschool Past Questions Archive (Record #34946)