+10 V IREF lo2 Q2 20 A R2

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter12: Electronic Control Devices
Section: Chapter Questions
Problem 2RQ: Semiconductors are ____________. conductors insulators half conductors none of the above
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IREF = 68 μA as shown. (a) What value of R2 is required to set IO2 =16 μA if the area Q1 is changed to 2A? (b) If the area of Q2 is changed to 10A?

+10 V
IREF
lo2
Q2
20 A
R2
Transcribed Image Text:+10 V IREF lo2 Q2 20 A R2
Expert Solution
Step 1

IREF = 68 µA

IO = 16 µA

 

Given circuit is a wilder current source.

The resistance R2 is given as,

Electrical Engineering homework question answer, step 1, image 1

Part (a) even if the area of the transistor is changed, if the transistors are connected in series, same amount of current flows through them. Thus,

 

Electrical Engineering homework question answer, step 1, image 2

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