Define kilowatt hour. How is it related to joule?
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kilowatt-hour is the energy spent (or work done) by a source of power 1 kW in 1 hour.
1 kWh = 3.6 × 106 joule.
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Express joule in terms of erg.
Define the term energy and state its S.I unit.
Define the term power. State its S.I. unit.
Differentiate between work and power.