Question

One way to get more energy out of fuels is to increase ______, the percentage of energy used for work.

Answer 1

The missing word is 'efficiency'

Answer 2

Efficiency

Step-by-step explanation:

Efficiency refers to the percentage of energy that is used to perform any work. The higher the efficiency of a fuel, the higher is percentage of energy used to do work. In other words, the efficiency of a fuel can be increased by increasing the amount of energy involved in any function. This would reduce the loss of energy and heat leading to more efficient fuels.