State the relation between $kWh$ and joule. Define $1$ watt.
(N/A) $1 \text{ kWh} = 1000 \text{ W} \times 1 \text{ h} = 1000 \text{ J/s} \times 3600 \text{ s} = 3.6 \times 10^6 \text{ J}$.
$1$ watt is defined as the power of an agent that performs work at the rate of $1$ joule per second.
$1$ watt is defined as the power of an agent that performs work at the rate of $1$ joule per second.
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