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A 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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The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.
Reason: in a parallel circuit each bulb gets the full supply voltage, so the voltage (and thus power) across each bulb doesn't change when you add more parallel bulbs. Adding bulbs lowers the circuit's total resistance, which increases the total current drawn from the source, but the current through each existing bulb stays essentially the same (unless the source has significant internal resistance or cannot supply the extra current).
Reason: in a parallel circuit each bulb gets the full supply voltage, so the voltage (and thus power) across each bulb doesn't change when you add more parallel bulbs. Adding bulbs lowers the circuit's total resistance, which increases the total current drawn from the source, but the current through each existing bulb stays essentially the same (unless the source has significant internal resistance or cannot supply the extra current).
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