A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connected in series ?

Resistance is doubled

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Resistance is same.

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Resistance is tripled

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Resistance is one half.

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Solution

The correct option is A Resistance is doubled
Components connected in series are connected along a single path, so the same current flows through all of the components. The current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component. The total resistance of resistors in series is equal to the sum of their individual resistances. That is,
$R_{t o t a l} = R_{1} + R_{2} + R_{3}$ .
When a bulb of the same resistance is connected in the series, the total resistance in the circuit is given as sum of both resistances connected. Hence the resistance is doubled.

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(f r e q u e n c y o f a c s o u r c e i s \frac{R}{2 π L_{0}} w h e r e L_{0} i s i n i t i a l i n d u c t a n c e)

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