McqMate
| Q. |
When the main switch of the house is put off it disconnects the – |
| A. | live wire only |
| B. | live wire and the earth wire |
| C. | live wire and the neutral wire |
| D. | earth wire and the neutral wire |
| Answer» C. live wire and the neutral wire | |
|
Explanation: Three wires enter most homes from the power pole—two "hot" wires and a third "neutral" wire. Each hot wire provides 120- volt current for conventional lights, receptacles, and appliances when paired with the neutral wire, which is normally kept at zero volts or "ground potential." When both, hot wires are used together with the neutral, they power large 240-volt appliances such as air conditioners and electric ovens. All the electric appliances stop working in a house when the main switch is put off because the electric circuit (the path where the electricity travels) gets opened. |
|
View all MCQs in
PhysicsNo comments yet