Physics for IGCSE & O level - Forces And Energy (Section 1 - No. 39)
What is the efficiency of a machine?
The total energy input divided by the useful energy output.
The total energy output divided by the total energy input, multiplied by 100.
The useful energy output divided by the total energy input, multiplied by 100.
The useful energy input divided by the total energy output, multiplied by 100.
Wyjaśnienie
Efficiency = (useful energy output / total energy input) * 100%