The direction of the current could be reversed by commuting the two wires in a special switch.

These special switches are often known as 911 Selective Routers.

To solve or prevent such problems, special switches and receptacles (outlets) are available.

To add to the illusion, Moe pressed a special switch under the dash and changed the light over the top of his windshield.

If we are so worried about the prospect wouldn't it be possible to build in a special switch, you know, one that switches it off?

I turned off the special switch that controls the bell, awhile ago, so we would not be disturbed.

For the competition, there was a special switch that would start all games simultaneously.

Learn all about these special switches by taking this quiz.

Once the elevator had descended, it could not rise again unless a special switch was pulled from above.

They are used in cameras, aircraft flight controls, automobile security systems, and special switches.