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An electric iron of resistance 20 ohm takes a current of 5 A. The heat developed in 30 seconds is:

Question
An electric iron of resistance 20 ohm takes a current of 5 A. The heat developed in 30 seconds is:
500 J
3000 J
15000 J
30000 J
Answer
15000 J
Detailed Explanation
H = I^2 R t = 5^2 x 20 x 30 = 25 x 20 x 30 = 15000 J.
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