Chapter 11 Electricity Questions-01
QUESTIONS
1. What does an electric circuit mean?
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Answer
A continuous and closed path of an electric current is called an electric circuit. An electric circuit consists of electric devices, source of electricity and wires that are connected with the help of a switch.
2. Define the unit of current.
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Answer
The unit of electric current is ampere (A). $1 A$ is defined as the flow of $1 C$ of charge through a wire in $1 s$.
3. Calculate the number of electrons constituting one coulomb of charge.
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Answer
One electron possesses a charge of $1.6 \times 10^{-19} C$, i.e., $1.6 \times 10^{-19} C$ of charge is contained in 1 electron.
$\therefore 1 C$ of charge is contained in $1 / 1.6 \times 10^{-19}=6.25 \times 10^{18}=6 \times 10^{18}$
Therefore, $6 \times 10^{18}$ electrons constitute one coulomb of charge.
