What is the commercial unit of electrical energy? Represent it in terms of joules.

(N/A) The commercial unit of electrical energy is the kilowatt-hour $(kWh)$.
To convert $1 \; kWh$ into joules $(J)$:
$1 \; kWh = 1 \; kW \times 1 \; h$
$1 \; kW = 1000 \; W = 1000 \; J/s$
$1 \; h = 60 \times 60 \; s = 3600 \; s$
Therefore,$1 \; kWh = 1000 \; J/s \times 3600 \; s = 3.6 \times 10^6 \; J$.