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%
36%
36%
56.25%
56.25%
156.25%
To find the space heater's efficiency, we need to determine the ratio of useful output energy to input energy.
The useful output energy is the sum of the thermal energy, kinetic energy, light energy, and sound energy, which is equal to 896 joules + 181 joules + 203 joules + 120 joules = 1400 joules.
The input energy is given as 1400 joules.
Therefore, the efficiency can be calculated as (useful output energy / input energy) x 100:
(1400 joules / 1400 joules) x 100 = 100%
Therefore, the space heater's efficiency is 100%.