Q. 12
Mention the commercial unit of energy. Express it in terms of joules. Calculate the energy in joule consumed by a device of 60 W in 1 hour.
Answer :
Commercial unit of Energy is Kilo Watt per hour denoted by kWh.
1kWh = 3600000 Joules
Energy Consumed in 1 hour
60 W = 60 j/s
1 hour = 60×60 seconds
⇒ Energy consumed in 1 hour = 60 ×60×60 = 216000 j
216000 Joules of energy is consumed in 1 hour.
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