Adrienne K.

asked • 02/25/20

I spent 7 minutes straightening my hair this morning, my straighteners transferred 252kJ of energy. What is their power?

Please help!!!!!!!!!!!!!!

1 Expert Answer

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William W. answered • 02/25/20

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Power = Energy/Time

The SI unit for energy is joules. To convert kj to j, we use the conversion factor that 1 kj = 1000 j. So 252kj = 252,000 joules


The SI unit for time is seconds. So 7 minutes x 60 sec/min = 420 seconds.


Power = Energy (in Joules)/Time (in seconds) = 252,000/420 = 600 watts

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