Question

An 95 Watt TV is plugged into a 115 volt circuit.
The TV operates for 120 minutes. If the cost of energy is
8¢ per kW-hr, how much does it cost to run the TV
for 120 minutes?

Answer 1

120 min = 2 hours

95 x 2 : 1000 =0.19 kwh

8¢ x 0.19 kwh = 1.52¢

Answer 2

The cost of running the 95 W TV for 120 minutes if charged at 8 ¢ per kWhr is 1.52 ¢

How to determine the energy

• Power ( P) = 95 W = 95 / 1000 = 0.095 KW
• Time (t) = 120 mins = 120 / 60 = 2 hr
• Energy (E) =?

E = Pt

E = 0.095 × 2

E = 0.19 KWhr

How to determine the cost of operation

• Energy (E) = 0.19 KWhr
• Cost per KWhr = 8 ¢
• Cost =?

Cost = Energy × Cost per KWhr

Cost = 0.19 × 8

Cost = 1.52 ¢

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