Electric currents, electric charges – problems and solutions
1. A steady current of 10 A exists in a wire for 2 minutes. How much the amount of charge that passes through the conductor at any location.
Electric current (I) = 10 A
Time interval (t) = 2 minutes = 2 x 60 seconds = 120 seconds
Wanted : Charge (Q)
Equation of the electric current :
I = q/t
I = the electric current, q = the electric charge, t = the time interval
The electric charge :
Q = I t = (10)(120) = 1200 C
2. 60 C of charge passes by a point in the circuit during 5 minutes. What is the electric current .
The time interval (t) = 5 minutes = 5 x 60 seconds = 300 seconds
The electric charge (Q) = 60 C
Wanted : The electric current (I)
The electric current :
I = Q/t
I = 60 / 300
I = 0.2 Coulombs/second
I = 0.2 Ampere
3. Unit of the electric current in SI system is…
Coulombs/seconds, given a special name, the Ampere.