In the diagram above, a 200 W bulb is lighted by a 240 V ...
In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1kwh is sold at N40, the cost of keeping the bulb lighted for a day is?
A.
N1,920.00
B.
N192.00
C.
N19.20
D.
N1.92
Correct answer is B
Energy consumed = power x time
= 200W x 24hr = 4800wh
= 4.8 kwh
But 1 kwh cost N40
∴ 4.8kwh costs 4.8 x 40
= N192