$CATEGORY: Science - Khan Academy/12.Electricity/12.Electricity--Electric Power

//Multiple Choice

The commercial unit of electrical energy is\: {
    ~Joule
    ~Watt
    =Kilowatt-hour
    ~Ampere
}

One kilowatt-hour is equal to how many joules? {
    ~1,000 joules
    ~3,600 joules
    =3.6 million joules
    ~360 joules
}

If a device consumes 1000 watts of power in 1 hour, the energy consumed is\: {
    =1 kilowatt-hour
    ~10 kilowatt-hour
    ~0.1 kilowatt-hour
    ~100 kilowatt-hour
}

Which of the following is a unit of power? {
    ~Joule
    ~Kilowatt-hour
    =Watt
    ~Coulomb
}

//True or False

The SI unit of electrical energy is the kilowatt-hour. {F}

1 kilowatt-hour equals 3.6 million joules. {T}

A 1 kW appliance running for 2 hours consumes 2 kilowatt-hours of energy. {T}

Electrical energy consumed by a device depends only on the power rating of the device. {F}


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