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%
56.25%
36%
156.25%
The space heater's efficiency can be calculated by dividing the useful energy output (thermal energy) by the total energy input, and then multiplying by 100 to express the result as a percentage.
Efficiency = (Useful energy output / Total energy input) * 100
In this case, the useful energy output (thermal energy) is 896 joules and the total energy input is 1,400 joules.
Efficiency = (896 / 1,400) * 100
Efficiency = 0.64 * 100
Efficiency = 64%
Therefore, the space heater's efficiency is 64%.