WAEC - Physics (1993 - No. 32)
A household refrigerator consumes electrical energy at the rate of 200 W. lf electricity costs 5 k per kWh, calculate the cost of operating the appliance for 30 days.
N7.20
N12.00
N30.00
N33.33
N72.00
Објашњење
E = 200 x 30 x 24 Wh = 144000; Wh = 144KWh
Cost 144 x 5k = N7.20
Cost 144 x 5k = N7.20