Question

Lee watches tv 3hours per day. Lee tv consumes 200 watts when on. Electricity cost 12 cents 1 kilowatt-hour how much does Lee's tv cost to operate for 30 days

Answer 1

Answer: $2.16

Lee watches TV 3 hours per day and TV consumes 200 watts.

Cost of electricity = 12 cents/(1-kilowatt-hour)

200w×3 hours

600 watt-hours

1000 watt-hours=1kwh

1 watt-hours= 1/1000 kwh

600 watt-hours 600/1000=0.6 kwh

0.6×12=7.2cents

1 day=7.2 cents

30 days

7.2×30

216 cents

$2.16

Answer 2

The cost of operating a 200-Watt TV 3 hours per day for 30 days is 2.16 dollars.

Explanation:

This problem ask us for the total cost associated with electricity consumption in a period of time. Hence, the total cost of energy is obtained by making appropriate conversions, that is:

Cost = Energy consumed x Time x Unit cost

`C = (200\,W) \cdot (30\,days) \cdot \left(3\,(h)/(day) \right)\cdot \left(3600\,(s)/(h)\right) \cdot \left((1)/(3600000) \,(kWh)/(J)\right)\cdot \left(0.12\,(USD)/(kWh) \right)`

`C = 2.16\,USD`

The cost of operating a 200-Watt TV 3 hours per day for 30 days is 2.16 dollars.