Page No 202: - 12) ELECTRICITY
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Question 1:
Name a device that helps to maintain a potential difference across a conductor.
Answer:
A source of electricity such as cell, battery, power supply, etc. helps to maintain a potential difference across a conductor.
Question 2:
What is meant by saying that the potential difference between two points is 1 V?
Answer:
If 1 J of work is required to move a charge of amount 1 C from one point to another, then it is said that the potential difference between the two points is 1 V.
Question 3:
How much energy is given to each coulomb of charge passing through a 6 V battery?
Answer:
The energy given to each coulomb of charge is equal to the amount of work required to move it. The amount of work is given by the expression,
Potential difference = 
Where,
Charge = 1 C
Potential difference = 6 V
Therefore, 6 J of energy is given to each coulomb of charge passing through a battery of 6 V.
