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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 same supply voltage, so the current through (and power dissipated by) each bulb doesn't change when more parallel branches are added. Adding bulbs in parallel lowers the equivalent resistance and increases the total current drawn from the source, but not the individual branch currents. (If the source has internal resistance or a limited voltage, the supply voltage might drop and then the bulbs could dim slightly.)
Reason: in a parallel circuit each bulb gets the same supply voltage, so the current through (and power dissipated by) each bulb doesn't change when more parallel branches are added. Adding bulbs in parallel lowers the equivalent resistance and increases the total current drawn from the source, but not the individual branch currents. (If the source has internal resistance or a limited voltage, the supply voltage might drop and then the bulbs could dim slightly.)
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