1 kWh is equal to:

#### 1 kWh is equal to:

1. A

$36×{10}^{6}J$

2. B

$3.6×{10}^{8}J$

3. C

$3.6×{10}^{6}J$

4. D

$3.6×{10}^{12}J$

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### Solution:

Assume we have a machine that consumes 1000 J of energy per second. This machine will consume 1 kWh of energy if used continuously for one hour.

Thus, $1\mathrm{kW}$ h is the energy used in one hour at the rate of $1000J{s}^{1}$ (or $1\mathrm{kW}$ ).

$1kwh=1\mathrm{kw}×1\mathrm{kh}$

$=1000W×3600s$

$3600000J$

$1\mathrm{kwh}=3.6×{10}^{6}\mathrm{J}$

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