Question

Calculate the cost of using four 500 W air-conditioners for eight hours each day for a 30 day month. The unit cost of electrical energy is Rs. 1.50 per kWh.

Answer 1

Four 500 W air-conditioners for eight hours each day for a 30 day month.

Energy spent is given by $Energy=Power\times time$

$Power=4\times 500W$ and $time=30\times 8hrs$

$Energy=4\ast 500\ast 30\ast 8=480000Wh$=$480kWh$

The unit cost of electrical energy is Rs. 1.50 per kWh

$cost=480\times 1.50=Rs.720$