Single Answer MCQ
Q-00019377
If an electric iron operates with a current of 4 A and a resistance of 10 Ω, what is the heat produced in 30 seconds?
1
480 J
2
600 J
3
1200 J
4
240 J
Answer and Solution
Answer
C. 1200 J
Solution:
Using H = I²Rt, H = (4 A)² × (10 Ω) × (30 s) = 4800 J. Thus, the heat produced is 4800 J. However, to convert to KJ, we divide by 1000 to get 4.8 KJ. None of the options is correct, indicating a mistake.
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