2 Way Switch Wiring With 9 Volt Battery

In modern homes and offices, it is often necessary to control a single light from two different locations. This convenience is made possible with 2 way switch wiring. Such a system is widely used in staircases, corridors, long halls, or bedrooms where turning the light on or off from more than one place is required. In this article, we will understand the working principle of the 2 way switch and its wiring based on the given diagram.

YouTube Demonstration: https://youtu.be/NEu4iU0v7nU

What is a 2 Way Switch?

A 2 way switch is a special type of electrical switch that has three terminals inside. These are:

1. Common (C)
2. L1
3. L2

When the switch is pressed, the connection of the common terminal changes between L1 and L2. This unique mechanism makes it different from a regular (1 way) switch, which only has two terminals.

following components are used:

1. 9V Battery – Power supply source.
2. 6V Lamp with Holder – The load.
3. Two 2 Way Switches – To control the lamp from two locations.
4. Connecting Wires – For making connections.

1. Connect the positive terminal of the 9V battery to the common terminal of the first switch.
2. Now connect the L1 and L2 terminals of the first switch to the L1 and L2 terminals of the second switch. These connections are called strapping wires.
3. From the common terminal of the second switch, take a wire and connect it to one end of the lamp.
4. Connect the other end of the lamp to the negative terminal of the battery.

This completes the circuit.

Working Principle

1. When both switches are in the same position (both up or both down), the circuit is complete, and the lamp glows.
2. When either one of the switches is flipped, the circuit breaks and the lamp turns off.
3. This allows the lamp to be controlled from two different locations.

Practical Applications

1. Staircases – Switch on the light at the bottom and switch it off when you reach the top.
2. Bedrooms – Turn the light on near the door and switch it off while lying on the bed.
3. Long corridors or halls – Control the light from both ends.

Advantages

1. Provides convenience and safety.
2. Helps in saving electricity as lights can be turned off easily from multiple points.
3. Simple and cost-effective wiring.
4. Useful in homes, offices, and industrial buildings.