In 1–2 sentences, explain how to calculate the efficiency of a toaster

To calculate the efficiency of a toaster, divide the amount of energy output by the amount of energy input and multiply by 100 to get a percentage.

To calculate the efficiency of a toaster, divide the useful output (heat transferred to toast) by the input energy (electrical energy consumed by the toaster) and multiply the result by 100 to express it as a percentage.

To calculate the efficiency of a toaster, divide the useful output energy (heat generated by the toaster) by the input energy (electricity consumed by the toaster) and multiply the result by 100 to express it as a percentage.