Mention the commercial unit of energy. Express it in terms of joules.

1.	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.

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.