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 130 joules produced sound energy. what is the space heaters efficiency
To find the space heater's efficiency, we need to compare the useful energy output (thermal energy) to the total energy input.
The total energy input is given as 1,400 joules.
The useful energy output (thermal energy) is given as 896 joules.
Efficiency is calculated as useful energy output divided by total energy input, multiplied by 100 to express it as a percentage.
Efficiency = (useful energy output / total energy input) * 100
Efficiency = (896 joules / 1400 joules) * 100
Efficiency = 0.64 * 100
Efficiency = 64%
Therefore, the space heater's efficiency is 64%.