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(a) Explain, in terms of the definition of power, why energy consumption is sometimes listed in...

(a) Explain, in terms of the definition of power, why energy consumption is sometimes listed in kilowatt-hours (kWh) rather than joules. What is the relationship between these two energy units?
(b) Does the work done in lifting an object depend on how fast it is lifted? Does the power expended depend on how fast it is lifted?
(c) How can a 50W light bulb use more energy than a 1 kW oven?

Science   Advanced-Physics   
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Energy consumption and work done

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