Sentence examples for it when needed from inspiring English sources

I created one just for this purpose (above) and will use it when needed.

This ring gear, instead of being permanently attached to the engine's flywheel, is coupled to it when needed via a clutch.

To compensate, some solar and wind farms maintain large, expensive banks of backup batteries to store surplus energy and release it when needed.

The rise of wireless devices will drive this trend too: instead of storing data internally, such devices will store information on the network and access it when needed.

If you're going to take the kind of heat the City Opera has for introducing amplification in the first place, you might as well do it when needed.

The greatest directors aren't the ones who direct the script but who can direct against the script, can undo it when needed.

Keep it in your purse, and take it out when needed.

Feed it only when needed.

Look it up when needed; you can always pretend you're writing down the scores.

It was summoned when needed.

That way it is on tap when needed.