Question

Calculate the electric current in the given circuit when
(i) key K1 is open and K2 is closed
(ii) both the keys are closed
(iii) K1 is closed and K2 is open

Answer 1

I) When K1 is open and K2 is closed then NO current flows through the circuit.

ii) When both the keys are closed the equivalent resistance of the ckt becomes 4 ohm so current will be
I = V/R = 12/4 = 3 A

iii) When K1 is closed and K2 is open then the equivalent resistance of the ckt becomes 8 ohm so current will be
I = V/R = 12/8 = 1.5 A