What is a relay in a car?

A. 1

Simply put, it's a switch using electromagnets.
For normal switches, the larger the voltage or current, the larger the switch itself must be to accommodate the amount of current flowing.
If you use the relay switch, you can make it smaller.
In cars, it is used in headlights or something like that.
The method is to allow electric current to flow through an electromagnet, which generates magnetic force and allows electric current to flow by making the iron that was separated at this time stick together.
So you can hear the clicking sound when you use the relay switch.

Gentleman 10 years ago 0

OK

A. 2

There are three, four, and five-pin relays, but cars usually use five pins.

Gentleman 10 years ago 0

OK