Final answer:
To calculate the annual energy consumption, convert the power consumption from watts to kilowatt-hours (kWh) by dividing the watts by 1000. then multiply the power consumption by the time duration (in hours) per day and the number of days per year. The energy consumed annually is 73 kWh.
Step-by-step explanation:
To calculate the annual energy consumption, we need to convert the power consumption from watts to kilowatt-hours (kWh). The power consumption in kilowatts (kW) can be calculated by dividing the watts by 1000. In this case, the power consumption is 0.8 kW (800 watts ÷ 1000).
To find the energy consumption, we multiply the power consumption by the time duration.
Energy consumption = Power consumption × Time duration
In this case, the time duration is 15 minutes per day, which is equivalent to 0.25 hours.
Energy consumption = 0.8 kW × 0.25 hours per day × 365 days per year
So, the energy consumed annually is 73 kWh. Therefore, the correct answer is d. 73kWh.