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Concepts Of Physics MCQ Edition [Volume 2]

Exam: Concepts Of Physics MCQ Edition [Volume 2]
Subject: Physics
Chapter: Electric Current in Conductors

Concepts Of Physics MCQ Edition [Volume 2] · Physics · Electric Current in Conductors

Three bulbs, each with a resistance of 180 , are connected in...

Three bulbs, each with a resistance of

180 \Omega

, are connected in parallel to an ideal battery of emf

60 \text{ V}

. Determine the current delivered by the battery when two of the bulbs are switched on.

Options

A $0.67 \text{ A}$
B $1.5 \text{ A}$
C $0.33 \text{ A}$
D $1.0 \text{ A}$

Correct answer

A. $0.67 \text{ A}$

Step-by-step solution

When two bulbs are switched on, they are connected in parallel across the battery.

The equivalent resistance of the circuit is given by

R_{eq} = \dfrac{R}{2} = \dfrac{180}{2} = 90 \Omega

The current delivered by the battery is

I = \dfrac{V}{R_{eq}} = \dfrac{60}{90} = \dfrac{2}{3} \text{ A}

I \approx 0.67 \text{ A}

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