
Anyways, I recently did a detailed research on relays.
They're more or less a remotely controlled switch which takes off the load from the circuit.
For example, in a relay connected horn, when you push the button, it activates a magnetic field in the relay coil. That pulls another switch and the horn circuit is activated. Now the current flows from the battery to the horn via the relay. The button and the wires to it are spared from the load.
They don't amplify the current.
Read this for further info.



And yes you're correct. As it bypasses all other electricals, it efficiently delivers the current directly to the device with maximum possible output.



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