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In the given circuit diagram, a voltmeter ‘V’ is connected aross a lamp ’L’. How would (i) the brightness of the lamp and (ii) voltmeter reading ‘V’ be affected, if the value of resistance ‘R’ is decreased? Justify your answer |
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Answer» (i) If the value of the resistance R is reduced, the current in the forward biased input circuit increases. The emitter current IE and the collector current IC (= IE – IB) both increase. Hence, the brightness of the lamp increases. (ii) Due to increase in IC, the potential drop across lamp L increases and hence the voltmeter reading V increases. |
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