WAEC - Physics (2004 - No. 39)
Find the cost of running a 60W lamp for 24 hours. If 1kW hr cost 5 naira
14.4 naira
12.5 naira
7.2 naira
2.0 naira
解释
Cost = P(Kwh) x Cost per KW
= \(\frac{60 \times 24}{1000} \times N5 = N7.2\)
= \(\frac{60 \times 24}{1000} \times N5 = N7.2\)