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If the resistance R(1) is increased (See...


If the resistance `R_(1)` is increased (See figure), how will the readings of the ammeter and voltmeter change?

Text Solution

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Here when `R_(1)` is increased in the input circuit, input current `I_(B)` decreases. Now, ouput current in common emitter circuit is `I_(C )=beta I_(B)` and so `I_(C )` decreases because of decrease in `I_(B)`. Hence reading in ammeter in the output circuit decreases. Hence, voltage `I_(C )R_(2)` across `R_(2)` in the output decreases (`because I_(C )` decreases). Hence reading in voltmeter, connected across `R_(2)`, will also decrease.
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