28 * 24 = ? Wh
8¢/ kWh = .008¢/ Wh
cost = Wh * .008¢/ Wh
How much does it cost to operate a 28-W porch light for 24 h if electric energy costs 8¢/ kWh .
2 answers
0.028kW * 24h = 0.672 kWh.
Cost = 0.672kWh * 0.08/kWh = 0.054 = 5.4 cents.
Cost = 0.672kWh * 0.08/kWh = 0.054 = 5.4 cents.