Learn how to test Relays with multimeter, how relay works

You are going to learn how to test electrical relays using the multimeter step by step. You are going also to learn how a relay works.
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[ligma]

Thank you. This was a good easy to understand explanation.

[vikramtrivedi]

Thank you very much Sir.
If possible please make a video on Optocupler testing. 4 pin and 6 pin.

[markw]

question please, can these be resistance tested in situ i.e still installed onto pcb with other pcb components still present but removed from the pcb power supply ? obviously not powering them with external rated power 12v in this case while still connected is probably a bad idea but will the circuit affect the readings.

[djdarkpsycho]

Can you apply voltage to the relay and measure continuity and resistance? Will not damage the multimeter?

[ashrafkarjiker]

Can you use a bench power supply to apply voltage to the relay and is it always 12 volts

[tnamen]

sir, why dont you used DIODE in the car relay? Where is the diode? Please explain why diode is not present in the relay?