Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Questions  >   In a transistor amplifier, change of 0.025V ... Start Learning for Free
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.
Attention Electronics and Communication Engineering (ECE) Students!
To make sure you are not studying endlessly, EduRev has designed Electronics and Communication Engineering (ECE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electronics and Communication Engineering (ECE).
Explore Courses for Electronics and Communication Engineering (ECE) exam

Top Courses for Electronics and Communication Engineering (ECE)

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?
Question Description
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? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about 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? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?.
Solutions for 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? in English & in Hindi are available as part of our courses for Electronics and Communication Engineering (ECE). Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free.
Here you can find the meaning of 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? defined & explained in the simplest way possible. Besides giving the explanation of 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?, a detailed solution for 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? has been provided alongside types of 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? theory, EduRev gives you an ample number of questions to practice 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? tests, examples and also practice Electronics and Communication Engineering (ECE) tests.
Explore Courses for Electronics and Communication Engineering (ECE) exam

Top Courses for Electronics and Communication Engineering (ECE)

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev