Question

(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) IN the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A

Answer 1

a) net current in the circuit = current in r + current in R

I = V/r + V/R

V/total R = V/r + V/R

1/ total R = 1/r + 1/R

b) (1) 3 + 2 = 5 ohm

and 1/R = 1/5 + 1/5, so, R = 2.5 ohm

(2) 4/ 2.5 = 1.6 A