The biggest unit of energy is

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Joule

Kilowatt-hour

Erg

Electron volt

answer is B.

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Detailed Solution

The biggest unit of energy is the kilowatt-hour.
Energy is defined as the ability to do some work. Its SI unit is the joule.
Now we convert each of the given units into the joule we get,

1 kilowatt - hour = 3.6 \times 10^{6}

joule

1 erg = 10^{- 7}

joule

1 electron - volt = 1.6 \times 10^{- 19}

joule
So kilowatt-hour is the biggest unit of energy among these.

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