Question

Draw diagrams to explain the working of a double-pole switching.

Answer 1

The circuit diagram shows how a single light bulb can be controlled independently from two different switches (S₁ and S₂), such as from the top and bottom of a staircase.

1. Bulb in the OFF Position (Circuit Open):

• Switch Positions: Switch S₁ is connected to terminal a (upward), and switch S₂ is connected to terminal c (downward).
• Working: The electrical path between the two switches is broken. Since the circuit is open, no current flows, and the bulb remains OFF.

2. Bulb ON Through Switch S₁ (Circuit Closed):

• Switch Positions: A person at the bottom flips switch S₁ downward to connect with terminal c. Switch S₂ remains connected to terminal c.
• Working: This creates a continuous, unbroken path along the bottom wire connecting terminal c of S₁ to terminal c of S₂. The circuit closes, current flows, and the bulb turns ON.

3. Bulb ON Through Switch S₂ (Circuit Closed):

• Switch Positions: Alternatively, if switch S₁ is connected upward to terminal a, a person at the top can flip switch S₂ upward to connect with terminal a.
• Working: This establishes a complete electrical path along the top wire connecting terminal a of S₁ to terminal a of S₂. The circuit closes, allowing current to flow, and the bulb turns ON.