Question

A certain household has consumed $250$ $units$ of energy during a month. How much energy is this in joules?

Answer 1

Energy consumed by a certain household = $250$ $kWh$
since $1$ $kWh$ = $3.6 × 10^6 \;J$
therefore $250$ $kWh$
= $250 × 3.6 × 10^6$
= $9 × 108$ $J$.