DC Circuit Analysis with a Potentiometer

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SUMMARY

The discussion focuses on analyzing a DC circuit with a 10 kΩ potentiometer as the resistive load. Participants emphasize the application of Ohm's Law (V=IR) to determine the current and voltage across the potentiometer at various positions. The circuit's ability to act as a constant current source is questioned, with explanations required for its behavior across the potentiometer's range. The problem-solving approach involves calculating current and voltage at the uppermost, lowermost, and intermediate positions of the potentiometer.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Familiarity with basic circuit components, specifically potentiometers
  • Knowledge of current source characteristics
  • Ability to interpret circuit diagrams
NEXT STEPS
  • Study the characteristics of constant current sources in circuits
  • Learn about the behavior of potentiometers in voltage divider circuits
  • Explore advanced applications of Ohm's Law in circuit analysis
  • Investigate the impact of load resistance on circuit performance
USEFUL FOR

Electrical engineering students, circuit designers, and hobbyists interested in DC circuit analysis and the practical applications of potentiometers in electronic circuits.

mrdworth
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I've been able to get all of the problems up to this point, but I have never seen a problem like this before, so here it goes:

9. Below is shown a simple resistive current source. The resistive load is represented
by a 10 kΩ potentiometer. What is the current through the resistive load over the
full range of the potentiometer and what is the reading on the voltmeter over the
full range of the potentiometer? Does this circuit represent a reasonable constant
current source? Why or why not (explain)?

Please see the following PDF (Question #9) for the diagram of the circuit:
http://www.engr.colostate.edu/ECE103/FA13/homeworks/Homework2%20FA2013.pdf

The only equations that I know that are useful here would probably just be Ohm's law and variants:
P=IV
V=IR
I=dQ/dt

Unfortunately, I don't know where to begin with this problem. The only true given is the voltage, so I don't know how to solve this problem.

Any help is appreciated!
 
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Subproblems:
- what are current and voltage if the potentiometer is at the uppermost position?
- what are current and voltage if the potentiometer is at the lowermost position?
- what are current and voltage if the potentiometer is somewhere in between?

You just need Ohm's law to solve that problem.
 

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