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An electric iron of resistance 20 …

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An electric iron of resistance 20 ohm takes a current of 5A. Calculate the heat develop in 30s 1.15 joules 2. 150 joules 3. 15000 joules 4. 1500 joules

Posted by Chakali Akhilesh 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 4 months ago

Resistance of the iron = 20 ohm

Current = 5 ampere

Time = 30 seconds

To Find :-

Heat Produced.

Formula to be used :-

Heat produced = I²RT

Putting all the values, we get

Heat produced = I²RT

Heat produced = 25 × 20 × 30

Heat produced = 15000 Joules.

Hence, the heat produced in 30 seconds is 15000 Joules.

1Thank You

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