StudentAidUnit 18: Electronics — Numericals
12th Class Physics · Unit 18: Electronics
18.1.In a certain circuit, the transistor has a collector current of 10 mA and base current of 40 μA. What is the current gain of the transistor?
Given
Collector current
IC = 10 mA = 10 × 10-3 A
Base current
IB = 40 μA = 40 × 10-6 A
Formula
Current gain
β = ICIB
Working
Substituting values
β = frac{10 × 10-3{40 × 10-6
Simplifying
= 1040 × 10-3-(-6) = 0.25 × 103
Result
Current gain
β = 250
18.2.Find the gain of the circuit as shown in figure.
Given
Configuration
Non-inverting amplifier: R1 = infty, R2 = 0
Formula
Gain of non-inverting amplifier
Gain = 1 + R2R1
Working
Substituting values
Gain = 1 + 0infty
Simplifying
= 1 + 0
Result
Gain
Gain = 1