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When you create a series circuit using two bulbs and one dry cell, the bulbs are dim. However, when you create a parallel circuit with two bulbs one dry cell, the bulbs are bright. Why are the two bulbs in the series circuit dim? Why are two bulbs in the parallel bright?

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Answer:

As more and more light bulbs are added, the brightness of each bulb gradually decreases. This observation is an indicator that the current within the circuit is decreasing. So for series circuits, as more resistors are added the overall current within the circuit decreases.

Explanation:The effect of adding the second lamp The effect of adding a second bulb in series is to increase the overall resistance of the circuit. The resistance previously provided by the thin filament wire of just one bulb is now doubled due to the presence of two.

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