Objective 4.4

Version 1

Efficiency = Useful Eout / Total Ein X 100

Useful Eout = Useful energy output (J)
Total Ein = Total energy input (J)
Efficiency = Efficiency (%)

Version 2
Efficiency = Useful Eout / Total Ein

Useful Eout = Useful energy output (J)

Total Ein = Total energy input (J)

Efficiency = Efficiency ( no units; a number between 0 and 1)