However, I do not know what you mean by "electricity being directly proportional to the electrical field".

Automatically opening doors are powered open and closed either by electricity, spring, or both.

"And she steers by electricity, too," Tom told his friend.

They may act out the cooking process without the adult knowledge about the production of heat by gas or electricity.

Whole cities under glass, fields, too, and lit by electricity or something very like it.

You, I think you'll find she won't even contemplate cooking by electricity.

The new structure was modern, powered by electricity, and it's been in operation to this day.

At the bottom of the ladder was a deck, lighted by electricity.

The new building had lighting by electricity and a safety curtain.