What happens to the brightness of the bulbs when the switch is opened? (A) all 3 bulbs go out (B)...

Question:

What happens to the brightness of the bulbs when the switch is opened?

(A) all 3 bulbs go out

(B) A and B get dimmer, C goes out

(C) A and B get brighter, C goes out

(D) A and B remain the same, C goes out

(E) A is brighter than B, C goes out

Parallel Combination of Resistors:

When two resistances are connected in a parallel, the current flowing through them gets divided while the voltages across them remain constant. In the diagram below we see that the current i is divided into two parts which pass through the two resistances.

The voltage across the two resistances is the same and is equal to the voltage of the battery V.

Answer and Explanation:

Given:

In the given diagram when the switch is opened, no current flows through the resistance C thus it goes out.

Now, we see that the resistances...

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Parallel Circuits: Definition & Examples

from General Studies Science: Help & Review

Chapter 3 / Lesson 10
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