Question

Three resistors of 6.0 12, 2-0 12 and 4.0 O2 are joined
to an ammeter A and a cell of e.m.f. 6-0 V as shown
in Fig. 8.54. Calculate :
(a) the effective resistance of the circuit, and
(b) the reading of ammeter.​

Answer 1

Explanation:

Combined resistance of R

2

and R

3

is given as 4+2=6 ohms.

The total resistance in the circuit is given as :

6

1

+

6

1

=

0.33

1

=3 ohms.

Hence, the effective resistance of the circuit is 3 ohms.

The current in the circuit is calculated from the formula I=V/R.

That is, I=

R

V

=

3Ω

6V

=2 A.

Hence, the reading of ammeter is 2 A.