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INTRODUCTION - 12) ELECTRICITY
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Question 1:
What does an electric circuit mean?
Answer:
An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are connected by conducting wires.
Question 2:
Define the unit of current.
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.
Question 3:
Calculate the number of electrons constituting one coulomb of charge.
Answer:
One electron possesses a charge of 1.6 × 10−19 C, i.e., 1.6 × 10−19 C of charge is contained in 1 electron.
∴ 1 C of charge is contained in 
Therefore, 
electrons constitute one coulomb of charge.
