ssm Onekilowatt·hour (kW·h) is the amount of work or energygenerated when one ki

Question

ssm Onekilowatt·hour (kW·h) is the amount of work or energygenerated when one kilowatt of power is supplied for a time of onehour. A kilowatt·hour is the unit of energy used by powercompanies when figuring out your electric bill. Determine thenumber of joules of energy in one kilowatt·hour.
1 J

Section 6.7 Power


In 2.0 minutes, a ski lift raises 5 skiers at constant speed to a height of 110 m. The average mass of each skier is 65 kg. Whatis the average power provided by the tension in the cable pullingthe lift?
1 W

Explanation / Answer

We know the conversion between kWh and joules is                         1kWh = 3 600 000 joule (2) The amount of power is P= mgh / t                                       = (65kg)(9.8m/s2)(110m) / (120s)                                       = 583.9 W

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