Efficiency

The video tutorial explains the concept of energy efficiency, which is calculated by dividing the useful energy output by the total energy input and converting it into a percentage. It highlights that loudspeakers have a low efficiency of around 3%, with most energy lost as heat. In contrast, the human body is highly efficient at converting food into energy, with a sprinter being four times more efficient than a motorbike.

How efficient is the human body at converting food into useful energy?

How does the efficiency of a sprinter compare to that of a motorbike?