1. What is Thevenin Equivalent Resistance?

Definition: Thevenin resistance (R_th) is the equivalent resistance of a linear electrical network when viewed from two output terminals.

Purpose: It simplifies complex circuits to a single voltage source and series resistance for analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R_{th} \) — Thevenin equivalent resistance (Ω)
• \( V_{oc} \) — Open-circuit voltage (V)
• \( I_{sc} \) — Short-circuit current (A)

Explanation: The open-circuit voltage is divided by the short-circuit current to determine the equivalent resistance.

3. Importance of Thevenin Resistance

Details: Thevenin's theorem allows simplification of complex circuits for analysis, making it easier to calculate load currents and voltages.

4. Using the Calculator

Tips: Measure the open-circuit voltage across the terminals, then measure the short-circuit current through the terminals. Enter both values.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Thevenin and Norton equivalent?
A: Thevenin uses a voltage source with series resistance, while Norton uses a current source with parallel resistance.

Q2: Can I use this for AC circuits?
A: Yes, but you'll need to use phasor values for V_oc and I_sc and consider impedance.

Q3: What if I get negative resistance?
A: Negative resistance suggests active components in the circuit (like dependent sources).

Q4: How accurate is this method?
A: It's theoretically exact for linear circuits but limited by measurement accuracy.

Q5: Can I use this for non-linear circuits?
A: No, Thevenin's theorem only applies to linear circuits.