A rotating space heater used 1,400 joules of energy while heating a room. Of that total, 896 joules produced thermal energy, 181 joules produced kinetic energy, 203 joules produced light energy, and 120 joules produced sound energy. What is the space heater’s efficiency?(1 point)
Responses
64%
64%
156.25%
156.25%
36%
36%
56.25%
To find the space heater's efficiency, we need to calculate the ratio of useful energy output to the total energy input.
The useful energy output includes thermal energy, kinetic energy, light energy, and sound energy, which totals to 896 + 181 + 203 + 120 = 1400 joules.
The total energy input is 1400 joules.
Therefore, the efficiency is (useful energy output / total energy input) * 100% = (1400 / 1400) * 100% = 100%.
None of the given options match the calculated efficiency of 100%.