Question

An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 h. Find the cost of
operating the toaster if the cost of electrical energy is Rs. 4.50 per kWh.

Answer 1

Given,
Voltage, v = 220 v
Current, I = 8 A
Time, t = 2 h
Energy, E = Vlt
E = 220 × 8 × 2 = 3520 Wh
⇒ E = 3.52 kwh
Cost of energy = Rs. 4.50 / kwh
∴ Cost of 3.52 kwh of energy = Rs. 4.50 × 3.52 kwh
                                               = 15.84