A simple circuit consisting of three resistors is shown above. When the switch is closed, the power dissipated in $R_{1}$ :

Increases

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Decreases

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Stays the same

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Cannot be determined without knowing the values of the Resistors

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Cannot be determined without knowing the source voltage

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Solution

The correct option is B Increases
When a resistor is connected in parallel to $R_{2}$ , the resistance of the circuit decreases. Hence more current flows into the circuit which directly goes into $R_{1}$ .
Power dissipated in $R_{1}$ is $i^{2} R_{1}$ .
As current in circuit increases on closing switch, the power dissipated also increases.

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A simple circuit consisting of three resistors is shown above. When the switch is closed, the power dissipated in R1:

A simple circuit consisting of three resistors is shown above. When the switch is closed, the power dissipated in $R_{1}$ :