Q. 4

# Three resistors a

Answer :

(i) According to the figure. R1 and R2 are connected in parallel.

Let I be the current following in the circuit, which is equal to 1A. After passing through the resistance R3

Current I is divided into two part say I1 and I2 (ii) Potential difference across AB = IR3 = 1 x 5 = 5V

As R1 and R2 are connected in parallel

So the equivalent resistance 1/Requivalent = 1/R1 +1/R2

1/Requivalent= 1/10 + 1/15

Requivalent= 6 ohm

Total resistance in the circuit

Rtotal= = 5+6 = 11 ohm

Potential difference across AC = IR = 1x11 = 11V

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