Predict what would happen to the brightness of bulbs A and B, if one of the bulb

Question

Predict what would happen to the brightness of bulbs A and B, if one of the bulbs C or D were unscrewed. Predict what would happen to the current through the battery, if one of the bulbs C or D were unscrewed. We predict there will be no change as current is maintained. Perform the experiments in part a and check your predictions. As Try this with the Circuit Construction Kit. Are your observations the same? Record here if you made any additional observations, or anything else that the simulation helped you notice. Does the total resistance of the circuit increase, decrease, or remain the same, if the bulb C or D is removed? Explain.

Explanation / Answer

Let R be the resistance of each bulb. And V be the voltage.

When all the bulbs are screwed, the resistance of the circuit is (R/2)+(R/2)=R

If either C or D is removed, the resistance of the circuit becomes R+(R/2)=3R/2.

So the current reduces,

Hence the brightness of the bulbs A and B will reduce as the current through each reduces from V/(2R) to V/(3R).

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