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What does an electric circuit mean?
An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are connected by conducting wires.
Define the unit of current.
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.
Calculate the number of electrons constituting one coulomb of charge.
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.
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