Select the word from the list that best fits the definition
one way to get more energy out of fuels is to increase the percentage of energy used for work.

Efficiency

Explanation:

The higher is the efficiency of a fuel , the more is the amount of energy used for work and hence more is the energy produced for operating any equipment or device.

For example if we use the best quality of coal i.e anthracite , the efficiency of energy production from this coal will be much higher as compared to the efficiency of energy production of a low grade coal. The quantity of fuel used also depend on the efficiency of fuel. A high efficiency fuel is required in less quantity as compared to a low efficiency fuel.

if you know your abc's you should be able to get your answer or just use google