Ch-12 Electricity (Question) Page200

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.