Asked by mimis
circuit contains two light bulbs connected in parallel. What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?
The brightness of each bulb would decrease because the total resistance of the circuit would decrease.
The brightness of each bulb would increase because the total resistance of the circuit would increase.
The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.
The brightness of each bulb would remain the same even though the total resistance of the circuit would increase.
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Answered by
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The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.
Explanation: In a parallel circuit each bulb gets the full source voltage, so each bulb's current I = V/R and power P = V^2/R stay the same. Adding more parallel bulbs lowers the equivalent resistance of the whole circuit and increases total current, but it does not change the voltage across — or the power dissipated by — each individual bulb (ignoring source internal resistance).
Explanation: In a parallel circuit each bulb gets the full source voltage, so each bulb's current I = V/R and power P = V^2/R stay the same. Adding more parallel bulbs lowers the equivalent resistance of the whole circuit and increases total current, but it does not change the voltage across — or the power dissipated by — each individual bulb (ignoring source internal resistance).
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