What happens to the brightness of the lamps connected in series and parallel? Give reason.

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Solution

When connected in series The brightness will get reduced because the total resistance of the bulbs will increase and their current will decrease.
Since current multiplied by voltage equals power (I x V = P , directly related to the light output), and the voltage in this case remains the same, the total power gets reduced, and the total light output (and brightness) gets reduced as well.

But in parallel connection voltage will be same for all so there will be no change in current drawn and power

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