A family uses 250 units of electrical energy during a month. Calculate this electrical energy in joules.

Explanation

250 units of electrical energy means 250 kWh of electrical energy. Now, we know that :
1 kWh of energy ` = 3.6 xx 10^(6) J`
So, 250 kWh of energy `= 3.6 xx 10^(6) xx 250 J`
`= 9 xx 10^(8)J`
Thus, 250 units of electrical energy is equal to `9 xx 10^(8)` joules.