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A resistor works by limiting the current that goes through it.

When current is limited, then voltage across the resistor also changes.

We use many forms of resistors in our normal day.

Lightbulbs are infact all resistors in one way or another.

When the filament in a lightbulb heats up, the resistance increases. When resistance increases, the current is reduced. In the end, the current has been reduced so much that it can no longer carry on heating up the filament. The bulb is then thermally stable and shines for our pleasure.

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