In the circuit shown in Fig.a voltage V is connected across lamp L. What changes would occur at lamp and the voltage V, if the resistance R is reduced in value?
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Here emitter base junction of npn transistor is forward biased with a battery and resistance R. If value of R is reduced, then the current in the input circuit increases and hence emitter current `I_(e)` increases. Therefore the collector current `I_c=I_(e)-I_b` will also increase. Due to it the bulb will glow more brillantly. voltage V measures the potential difference across lamp L. Due to increase in collector current, the potential difference across L increases, hence the reading of voltage will increase.
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