Answer
An electric circuit means a continuous and closed path of an electric current.
Q.No. 2. Define the unit of current.
Answer
The electric current is expressed by a unit called ampere (A), named after the French scientist, Andre-Marie Ampere . One ampere is constituted by the flow of one coulomb of charge per second, that is, 1 A = 1 C/1 s.
Q.No. 3. Calculate the number of electrons constituting one coulomb of charge.
Answer
We know that
1.6×10-¹⁹ coulomb charge = 1 Electron.
or, 1 coulomb charge = 1÷(1.6×10-¹⁹) Electrons.
or, 1 coulomb charge = 6×10¹⁸ Electrons.
Q.No.1. Name a device that helps to maintain a potential difference across a conductor.
Answer
Battery or a combination of cells helps to maintain a potential difference across a conductor.
2. What is meant by saying that the potential difference between two points is 1 V?
Answer
One volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other.
Therefore,
1 volt = 1 joule/1 coulomb
1 volt = 1joule per coulomb.
1 V = 1 J/C.
3. How much energy is given to each coulomb of charge passing through a 6 V battery?
Answer
Work done = Potential difference×Charge
or, Work done = 6×1
or, Work done = 6 joule.
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