Circuit Components-Variable resistors

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As the contact point Y moves closer to X in a circuit, the length of the wire decreases, resulting in lower resistance. This decrease in resistance allows more current to flow through the circuit, which increases the brightness of the lamp. The relationship between current, voltage, and resistance is governed by Ohm's law (I=V/R), indicating that with a fixed voltage, reduced resistance leads to increased current. The discussion highlights the direct correlation between resistance and the brightness of the lamp in a series circuit. Understanding this concept clarifies how adjustments in resistance affect the performance of circuit components.
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Homework Statement


As contact point Y moves to X, the lamps becomes brighter. Why is this so?

Homework Equations


R=p (length/Area)
I=V/R

The Attempt at a Solution



As Y moves closer to X, length of wire decreases, hence resistance decreases and brightness of lamp increases.

I am not clear of the concept of brightness of lamp and resistance of wire. Please help, thank you![/B]
 

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The lamp is in a series circuit with a power supply with a fixed voltage. What would make the light bulb burn brighter?
 
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