Question

If an electric motor uses 50 kJ of energy to do 46 kJ of work, how efficient is it?

Answer 1

Answer: 92%

Step-by-step explanation:

The efficiency of the electric motor is 92%. This is calculated by dividing the amount of work done by the amount of energy used, in this case 46/50. This gives 0.92, or 92%.

Answer 2

The efficiency of an electric motor can be calculated using the formula:

Efficiency = (Work output ÷ Energy input) x 100%

In this case, the motor uses 50 kJ of energy to do 46 kJ of work. Plugging in the values:

Efficiency = (46 kJ ÷ 50 kJ) x 100%

Efficiency = 0.92 x 100%

Efficiency = 92%

Therefore, the efficiency of the electric motor is 92%.

Step-by-step explanation: