How is Thevenin equivalent resistance determined in a circuit?

How is Thevenin equivalent resistance determined in a circuit?

• A. By shorting the power supply
• B. By removing the load and measuring voltage
• C. By opening the power supply
• D. By measuring the current flowing through

Answer: (C)

To determine the Thevenin equivalent resistance in a circuit, the procedure involves calculating the resistance seen by the load terminals when all independent power sources are turned off. One common method to achieve this is by opening the power supply. When an independent voltage source is present, it is replaced by a short circuit, while an independent current source is replaced by an open circuit. By considering the circuit from the load’s perspective with the power supply turned off (opened), you can effectively see how the resistors interact with each other, allowing you to calculate the equivalent resistance that would be seen by a load connected across those terminals. This approach to finding Thevenin resistance ensures that the original circuit conditions do not interfere with the measurement and provides an accurate equivalent for analysis under load conditions. This means that while the other options might hint at relevant concepts in circuit analysis, the method that focuses on the correct treatment of power sources clearly leads to the accurate determination of Thevenin equivalent resistance.

To determine the Thevenin equivalent resistance in a circuit, the procedure involves calculating the resistance seen by the load terminals when all independent power sources are turned off. One common method to achieve this is by opening the power supply. When an independent voltage source is present, it is replaced by a short circuit, while an independent current source is replaced by an open circuit. By considering the circuit from the load’s perspective with the power supply turned off (opened), you can effectively see how the resistors interact with each other, allowing you to calculate the equivalent resistance that would be seen by a load connected across those terminals.

This approach to finding Thevenin resistance ensures that the original circuit conditions do not interfere with the measurement and provides an accurate equivalent for analysis under load conditions. This means that while the other options might hint at relevant concepts in circuit analysis, the method that focuses on the correct treatment of power sources clearly leads to the accurate determination of Thevenin equivalent resistance.