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Types of Electric Circuits Series and Parallel

If X, Y a...

Question

If $X$ , $Y$ and $Z$ in figure are identical lamps, which of the following changes to the brightness of the lamps occur when switch $S$ is closed?

X

stays the same,

Y

decreases

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X

increases,

Y

decreases

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X

increases,

Y

stays the same

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X

decreases,

Y

increases

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Solution

The correct option is B $X$ increases, $Y$ decreases
Resistance of circuit decreases that increases current through X. So, it's brightness increase. The voltage across Y decreases so, it's brightness will decreases.
The correct option is B.

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