Answered: Figure P2.31 i, (mA)| v, (V) 40 35 10…

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Figure P2.31 i, (mA)| v, (V) 40 35 10 30 20 CCS Vs 25 30 18 40 50 55 (a) (b) Figure P2.31 Full Alternative Text

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 6RQ: What is CEMF?

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Concept explainers

Thevenin Theorem

Any linear circuit, no matter how complex, maybe simplified to an equivalent circuit utilizing only a single voltage source and series resistance coupled to a load, according to Thevenin's Theorem. The superposition principle says that all foundational equations must be linear, and the notion of "linear" is still the same (i.e., there should not be any exponentials or roots). This is particularly the case when operating with passive elements like resistors, inductors, and capacitors. However, some components (particularly some gaseous and semiconductor devices like tunnel diode, Schottky diode, transistors like BJT, MOSFET) are nonlinear, meaning their current resistance fluctuates with voltage and current. As a result, circuits made up of these parts are known as nonlinear circuits.

Question

The table in (a) gives the relationship between the terminal current and voltage of the practical constant current source shown in (b).

1. Plot is versus vs.
2. Construct a circuit model of this current source that is valid for
0≤vs≤30 V, based on the equation of the line plotted in (a).
3. Use your circuit model to predict the current delivered to a 3 kΩ
resistor.
4. Use your circuit model to predict the open- circuit voltage of the
current source.
5. What is the actual open-circuit voltage?
6. Explain why the answers to (d) and (e) are not the same.

Figure P2.31
i, (mA)| v, (V)
40
35
10
30
20
CCS
Vs
25
30
18
40
50
55
(a)
(b)
Figure P2.31 Full Alternative Text

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