What is the Thevenin equivalent of a circuit?

Practice Questions

Q1
What is the Thevenin equivalent of a circuit?
  1. A single voltage source and series resistance
  2. A single current source and parallel resistance
  3. A combination of capacitors
  4. A complex impedance

Questions & Step-by-Step Solutions

What is the Thevenin equivalent of a circuit?
Correct Answer: Thevenin equivalent circuit is a single voltage source in series with a resistance.
  • Step 1: Identify the part of the circuit you want to simplify. This is usually the section where you want to find the voltage or current.
  • Step 2: Remove the load resistor (if there is one) from the circuit. This is the component you are analyzing.
  • Step 3: Find the open-circuit voltage (Voc) across the terminals where the load was connected. This is the voltage that would be present if no load was connected.
  • Step 4: To find the Thevenin resistance (Rth), turn off all independent voltage sources (replace them with a wire) and turn off all independent current sources (replace them with an open circuit).
  • Step 5: Calculate the equivalent resistance seen from the terminals where the load was connected. This is your Thevenin resistance (Rth).
  • Step 6: Now, you can represent the original circuit as a single voltage source (Voc) in series with a resistance (Rth). This is the Thevenin equivalent circuit.
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