Re: what is a relay?

Posted by john in la on November 14, 2004 at 07:00:52 from (66.157.26.193):

In Reply to: what is a relay? posted by StuBC on November 14, 2004 at 06:35:58:

A relay is a way of moving more electricity than your switch can handle. It can also be used to move large amounts of electricity a short distance with out running large wires all the way to the switch which may be far away. Think of a starter relay.
It has two large wires where the power from the battery is hooked to the starter. Since we do not want to run large battery cable to the key and the key would not handle this much power any way we use a relay.
The relay is built with a plunger in it. In the rest position the large terminals are not connected. We push the start button or turn the key and this sends power through a coil of small wires in the relay. This coil of wire creates a magnetic field which moves the plunger so the power is connected through the two large terminals.
Most tractors and equipment do not have enough lights to need a relay. On the other hand you see some big trucks going down the road with many lights. They look like a Xmas tree. If you had that many lights you would need multiple switches or a relay. LED lights have cured this because they do not need as much power to work.

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