Question

Two resistor x and y of resistance 2 and 3 are first joined in parallel and then in series. In each case the voltage supply is 5v.draw the circuit diagram to show the combination of resistors in each case .calculate the voltage across the 3 resistor in the series combination.

Answer 1

Answer:

Explanation:

The voltage across 3 ohm resistor is 3 Volts.

Explanation:

We are given:

The resistance of X = 2 ohm

The resistance of Y = 3 ohm

Voltage applied = 5 V

The equivalent resistance in sereis:

Req = R1 + R2

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Req = 2 + 3 = 5 ohm

The equivalent resistance in parallel:

1 / Req = 1 / R1 + 1/ R2

! / Req = 1 /2 + 1/3

Req = 6 / 5 = 1.2 ohm

The volatge acrss 3 ohm resistor:

I = Voltage / R eq

I = 5 V / 5 ohm

I = 1 A

Now V = I x R3

V = 1 A x 3 ohm

V = 3 Volts

Thus the voltage across 3 ohm resistor is 3 Volts.