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Resistance

In the given ...

Question

In the given circuit diagram , a voltmeter 'V' is connected across a lamp 'L' . How would the brightness of the lamp if the value of resistance 'R' is decreases ? Justify your answer.

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Solution

If the value of resistance R is reduced , the current in the forward biased input circuit increases. The emitter current $I_{E}$ and the collector current $I_{C} = (I_{E} - I_{B})$ both increase. Hence , the brightness of the lamp increases.

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