How a 12v relay works?

Answer 1

A DC relay is a relatively simple device that uses a single coil, normally wound round an iron core. When a voltage is applied, current flows through the coil and generates a magnetic field. As the magnetic field increases, a spring loaded lever is attracted to the core and moves the switch contacts from an "off" state to an "on" state.

The lever will be held in place as long as the current flows in the coil. When the coil current drops to zero, the magnetic field decays and the lever is released, the spring then pulls it back to it's off position.

Answer 2

When you hit the switch, it powers up an electromagnet that attracts one contact strongly enough to overcome the spring, and bring it against the other contact to close the circuit.

The reason for using a relay, is so that you can power a load that requires a lot of current, without having to run heavy cable all the way to the switch and back. Also, for safety, so you don't have to throw the switch on a potentially lethal amount of current.

A relay takes a high current circuit and uses low current to turn the high current on and off. Its basically a high current switch. There are coils that are designed to handle the high currents constantly. A switch could do the job of turning circuits on and off but has a drastic higher failure rate.

Answer 3

A relay takes a high current circuit and uses low current to turn the high current on and off. Its basically a high current switch. There are coils that are designed to handle the high currents constantly. A switch could do the job of turning circuits on and off but has a drastic higher failure rate.

Answer 4

The same as a DC relay it's got a electro magnet that pulls the contactors open or close.

Answer 5

Current is supplied to the electromagnet and magnitised and attract the soft iron armature. Then it closes the contact allowing the current to flow.

Answer 6

they change the curreent etc