. Three resistors of 6.0 ohm, 2.0 ohm and 4.0 ohm are joined to an ammeter A and a cell of emf 6.0 V as shown in figure. Calculate


Three resistors of 6.0 ohm, 2.0 ohm and 4.0 ohm are joined to an ammeter A and a cell of emf 6.0 V as shown in figure. Calculate:

(a) the efective resistance of the circuit.

(b) the reading of ammeter

Best Answer

(a) R1 = 6 W

R’ = R2 + R3

R’ = 2 + 4

R’ = 6 W

R1 and R’ are connected in parallel

1 / R = 1 / R1 + 1 / R’

1 / R = 1 / 6 + 1 / 6

1 / R = 2 / 6

1 / R = 1 / 3

R = 3 ohm

(b) R = 3 ohm

V = 6 V

I =?

I = V / R

I = 6 / 3

I = 2 A

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