Question

An air conditioner is rated $240V,1.5kW$. The air conditioner is switched on for $8$ hours each day. How much electrical energy is consumed in $30$ days ?

• A. $360kWh$
• B. $8.64kWh$
• C. $120kWh$
• D. $240kWh$

Answer 1

The correct option is A $360kWh$

Answer is A.

If a certain amount of power is dissipated for a given time, then energy is dissipated. Energy (powertime) is measured in Joules and by including time (t) in the power formulae, the energy dissipated by a component or circuit can be calculated.
Energy dissipated = Pt .
In this case, the power dissipated is 1.5 kW and it runs for 8 hours a day.
So, in a day, the energy dissipated is 1.5 * 8 = 12 Kwh.
For 30 days, the power dissipated is 12 * 30 = 360 Kwh.
Hence, the electrical energy is consumed by the air conditioner in 30 days is 360 Kwh.