Question

3. Find (i) the net resistance flowing through the circuit. (ii) the total current flowing in the circuit. (iii) The current flowing when 1 is closed and 2 is open.​

Answer 1

Explanation:

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Question

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The circuit diagram given below shows the combination of three resistors R

1

,R

2

and R

3

. :

Find : (i) total resistance of the circuit.

(ii) total current flowing in the circuit.

(iii) total p.d. across R

1

.

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Solution

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(i) Total resistance of two resistors that are connected in parallel is

1/R

′

=1/3+1/6

1/R

′

=3/6

R

′

=2ohms

Total resistance of the circuit =2+4ohms=6ohms

(ii) Total current flowing through the circuit = V / total resistance

I=12/6=2amps

(iii) Potential difference across R

1

V=R

1

×I=4×2=8V.