Answer :
Final answer:
To find the cost of running a 100-watt light bulb for 5 hours each day for 30 days at the rate of 10 cents per kilowatt-hour, we need to multiply the energy consumed (15 kWh), by the cost per unit of energy (10 cents). The total cost comes out to be $1.5.
Explanation:
The question is asking you to calculate the cost of running a 100-watt light bulb for a total of 5 hours each day for 30 days, given that the electric company charges 10 cents per kilowatt-hour. The first step is to understand that electrical energy is calculated using the formula E=Pt, where E stands for energy in kilowatt-hours (kWh), P for power in kilowatts (KW), and t for time in hours. In this case, the power, P, is 100 watts (or 0.1 KW because a kilowatt is 1,000 watts).
For the time, t, you're running the light bulb for 5 hours a day for 30 days, which is 5*30 = 150 hours. If you substitute these values into the formula, you get E = 0.1 KW * 150 hours = 15 kWh. This is the total amount of energy consumed.
Finally, given that the electric company charges 10 cents per kWh, the total cost would be 15 kWh * 10 cents = $1.5.
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