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In a transistor amplifier, change of 0.025V in signal voltage causes the base current to change by 15 µA and collector current by 1.2 mA. If collector and load resistances are of 6kΩ and 12kΩ, determine input resistance in kΩ.
  • a)
    1.5
  • b)
    1.9
Correct answer is between '1.5,1.9'. Can you explain this answer?
Most Upvoted Answer
In a transistor amplifier, change of 0.025V in signal voltage causes ...
Input resistance = change in input voltage / change in input current
= 0.025/15 x 10 ­-6
= 1.67kΩ
Free Test
Community Answer
In a transistor amplifier, change of 0.025V in signal voltage causes ...
Given Data:
- Change in signal voltage (∆Vsignal) = 0.025V
- Change in base current (∆Ibase) = 15 µA
- Change in collector current (∆Icollector) = 1.2 mA
- Collector resistance (RC) = 6kΩ
- Load resistance (RL) = 12kΩ

Calculations:
1. Calculate the incremental base resistance (rb):
rb = ∆Vsignal / ∆Ibase
rb = 0.025V / 15 µA
rb = 1.67 kΩ
2. Calculate the incremental collector resistance (rπ):
rπ = ∆Vsignal / ∆Icollector
rπ = 0.025V / 1.2 mA
rπ = 20.83 kΩ
3. Calculate the input resistance (ri):
ri = rb + (β + 1) * rπ
Assuming β ≈ 100 for a transistor amplifier,
ri = 1.67 kΩ + (100 + 1) * 20.83 kΩ
ri = 1.67 kΩ + 2083 kΩ
ri = 2084.67 kΩ
ri ≈ 2.08 kΩ
Therefore, the input resistance of the transistor amplifier is approximately 2.08 kΩ. Hence, option b) 1.9 is the correct answer.
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In a transistor amplifier, change of 0.025V in signal voltage causes the base current to change by 15 µA and collector current by 1.2 mA. If collector and load resistances are of 6kΩ and 12kΩ, determine input resistance in kΩ.a)1.5b)1.9Correct answer is between '1.5,1.9'. Can you explain this answer?
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