Calculating Thevenin Voltage in Circuit w/Load Resistor

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    Thevenin Voltage
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SUMMARY

The discussion focuses on calculating the Thevenin voltage and resistance in circuits with load resistors. To determine the Thevenin resistance, one can either replace the load with an open circuit and calculate the output voltage, or short the load and calculate the output current, using the ratio of V/I. Additionally, removing all voltage and current sources allows for the calculation of Thevenin resistance. The Thevenin voltage can be computed by applying known load resistances to the output terminals, with one often being infinite resistance.

PREREQUISITES
  • Understanding of Thevenin's Theorem
  • Knowledge of circuit analysis techniques
  • Familiarity with voltage and current sources
  • Basic skills in using resistors in series and parallel
NEXT STEPS
  • Study Thevenin's Theorem in detail
  • Learn to apply circuit analysis techniques for complex circuits
  • Explore the use of simulation tools like LTspice for circuit analysis
  • Investigate practical applications of Thevenin equivalent circuits
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Electrical engineering students, circuit designers, and professionals involved in circuit analysis and design will benefit from this discussion.

esmeco
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I was wondering,how do we calculate the thevenin resistance in a circuit with a load resistor?Do we remove the load?How do we calculate the voltage at the load terminals?
 
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esmeco said:
I was wondering,how do we calculate the thevenin resistance in a circuit with a load resistor?Do we remove the load?How do we calculate the voltage at the load terminals?

Well, there are a couple of ways you can calculate the thevenin resistance. The formal way would be to replace the load with an open and then calculate the output voltage there and then to replace the load with a short and then calculate the output current there. The ratio of the calculated V/I is the thevenin resistance.

You can also remove all voltage sources and current sources (short voltage sources and open current sources and then determine the thevenin resistance. You would remove the load resistance.
 
you can compute the thevenin voltage and thevenin resistance by applying two different and known load resistances to the output terminals. often one of those loads is an infinite resistance (then the output voltage is the thevenin voltage), but it doesn't have to be.
 

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