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The video explains how to calculate energy conversion efficiency by dividing useful energy by total energy and multiplying by 100 to get a percentage. It highlights that speakers have a low efficiency of around 3%, with most energy lost as heat. In contrast, the human body is highly efficient, converting food into energy, with a sprinter's performance being four times greater than a motorcycle's.

How is the efficiency of a process calculated?

• By adding the useful energy to the total energy

• By subtracting the useful energy from the total energy

• By dividing the useful energy by the total energy and converting it to a percentage

• By multiplying the total energy by the useful energy

What percentage of energy do speakers typically convert into sound?

• 50%

• 3%

• 97%

• 10%

What happens to the majority of energy received by speakers?

• It is used to power other devices

• It is stored for later use

• It is converted into light

• It is converted into heat

How does the efficiency of the human body compare to that of a motorcycle?

• The human body is less efficient

• The human body is equally efficient

• The human body is more efficient

• The human body is not efficient at all

In terms of performance, how does a sprinter compare to a motorcycle?

• A sprinter performs half as well

• A sprinter performs the same

• A sprinter performs four times better

• A sprinter performs twice as well