Final answer:
To calculate the kilowatt-hours of energy used by the TV, convert the power to kilowatts, multiply by the average hours of use per day, then by the number of days in the week, and round to the nearest tenth.
Step-by-step explanation:
The question is asking how many kilowatt-hours of energy are used by a TV set with a power rating of 75W over a week, when it is used for an average of h hours each day. To calculate this, you need to use the formula:
Energy (kWh) = Power (kW) × Time (hours)
Firstly, we convert the power from watts to kilowatts:
Power in kilowatts = Power in watts / 1000 = 75W / 1000 = 0.075 kW
Next, we find the total time the TV is used in hours over a week:
Total time = h hours/day × 7 days/week
Now we can calculate the total energy consumed:
Energy (kWh) = 0.075 kW × h hours/day × 7 days/week
Finally, round the answer to the nearest tenth.
This problem involves understanding energy consumption in terms of power, time, and their relation to average usage.