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Answer :
Final answer:
A 100-watt light bulb consumes 200 watt-hours (Wh) of energy per day and 73,000 Wh (73 kWh) per year. In terms of BTUs, it consumes 682.4 BTUs per day and 249,476 BTUs per year. In terms of joules, it consumes 720 x 10^6 joules per day and 262.8 x 10^9 joules per year.
Explanation:
To calculate the energy consumed by a 100-watt light bulb per day, we can use the formula E = Pt, where E is the energy in watt-hours (Wh), P is the power in watts, and t is the time in hours. Given that the light bulb is on for 2 hours a day, we can substitute the values into the formula:
E = 100 watts x 2 hours = 200 watts (Wh) per day.
To calculate the energy consumed by the light bulb per year, we need to multiply the energy consumed per day by the number of days in a year. Assuming there are 365 days in a year, the energy consumed per year is:
E = 200 watt-hours x 365 days = 73,000 watt-hours (Wh) per year = 73 kilowatt-hours (kWh) per year.
In terms of BTUs (British Thermal Units), 1 watt-hour is equivalent to 3.412 BTUs. Therefore, the energy consumed by the light bulb per day is:
E = 200 watt-hours x 3.412 BTUs = 682.4 BTUs per day.
The energy consumed per year is:
E = 73,000 watt-hours x 3.412 BTUs = 249,476 BTUs per year.
In terms of joules, 1 watt-hour is equivalent to 3.6 x 10^6 joules. Therefore, the energy consumed by the light bulb per day is:
E = 200 watt-hours x 3.6 x 10^6 joules = 720 x 10^6 joules per day.
The energy consumed per year is:
E = 73,000 watt-hours x 3.6 x 10^6 joules = 262.8 x 10^9 joules per year.
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