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1. Define electric potential and potential difference.
Electric potential | Potential difference |
It is the amount of work done in moving a unit to that point against the electric force. | It is the amount of work done in moving a unit against the electric force. |
SI unit is . | SI unit is . |
| It determines the . | The gives the potential difference. |
2. What is the role of the earth wire in domestic circuits?
In most household circuits, a third wire, known as the earth wire, is attached to the body of the .
The earth wire has , and its opposite end is attached to buried in the ground.
This wire gives a channel to the electric current.
When a live wire accidentally contacts the body of a metallic electric appliance, the earth wire directly transmits the current from the .
As a result, the earth wire acts as a , preventing us from electric shocks.
3. State Ohm’s law.
Ohm's law states that at a , the flowing through a conductor is directly proportional to the between the two ends of the conductor.
Mathematically, it is written as .
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