how 3 way light switch works?

How does a 3-way switch works?
" 3 - way " is the electrician's designation for a single pole double throw (SPDT) switch. The switches must create a complete circuit for current to flow and the bulb to light. When both switches are up, the circuit is complete (top right). When both switches are down, the circuit is complete (bottom right).
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How does a light switch work?
Power-Through Switches
With power-through wiring, power enters the switch box directly. ... The hot black wire from the power source travels through the switch and from there to the light. Flipping the switch interrupts the flow of electricity to the light, turning it off and on. Oct 23, 2020
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What is the difference between a 2 way and 3-way switch?
In a normal switch, the two terminals are either connected (as shown) or disconnected. When they are connected, the switch is "on." In a three - way switch, the top terminal connects to one or the other of the bottom two terminals.
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What wires go where on a 3-way light switch?
Figure A: 3-Way Switch Wire Diagram — Power to Light Fixture
The black hot wire connects to the far right switch's common terminal. Red and blue wires link traveler terminals of both switches. The red wire, which is connected to the first switch's common terminal, leads back to the fixture.
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