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What would happen to the brightness of the bulb in the following circuit as I increase the resistance of the variable resistor? Explain your answer

What Would Happen To The Brightness Of The Bulb In The Following Circuit As I Increase The Resistance Of The Variable Resistor Explain Your Answer class=

Sagot :

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As you crank the variable resistor to higher resistance, the total current in the loop decreases.  The power dissipated by the light bulb ... the heat and brightness it produces ... depend directly on the current through it, so they decrease too.  Your circuit is a perfect incandescent light dimmer circuit.
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