But if I should be forced to return, the energy required is far less.

Some jobs require more energy than education, and we should not lose them.

It requires energy to move so many parts of your body at the same time.

To produce power over any given period of time requires energy.

Thus, plants provide the energy and air required by most life forms on Earth.

There would be released, for each man, just the energy required to kill him.

In some cases, the amount of energy required by the load is too small.

The energy required to do so is the weight and the height.

The energy required would be exactly the same as if you used a rocket.

He used no more than the minimal energy required for each action.