Thevenin Resistance Calculator

The Thévenin-equivalent resistance RTh is the resistance measured across points A and B "looking back" into the circuit. This calculator calculates the Thevenin resistance of a single-phase full bridge rectifier.

Enter the Supply Frequency and Supply Inductance to calculate the Thevenin Resistance

  • rad./sec
    This is a required field.
  • H
    This is a required field.

Result

  • Thevenin Resistance
    ohm

Thevenin's theorem states that any linear circuit made up only of voltage sources, current sources, and resistances can be replaced by an equivalent arrangement of a voltage source (VTh) in series with a single resistance (RTh) connected across the load. This is also known as the Helmholtz-Thévenin theorem. This shortened circuit is known as the Thevenin Equivalent Circuit. Thevenin's theorem was created by French engineer Léon Charles Thévenin (hence the name). Using the Thevenin theorem, a complex electrical circuit is reduced to a simple two-terminal Thevenin equivalent circuit. In a Thevenin equivalent circuit, one Thevenin resistance and one Thevenin voltage source are connected to a load.

The resistance measured "backward" into the circuit between points A and B is the resistance to Thévenin-equivalent RTh. The resistance is measured after all sources of voltage and current have been replaced with their internal resistances. The ideal current source is an open circuit, whereas the ideal voltage source is a short circuit. Then, using the formulae for series and parallel circuits, resistance may be calculated across the terminals. Only circuits with separate sources can use this tactic. If the circuit has dependent sources, a different strategy must be used, such as connecting a test source across A and B and measuring the voltage or current through the test source.

By setting the values of the sources (voltage or current) to zero, thevenin substitutes for the sources may be remembered as a mnemonic. The source is substituted with a short circuit because a zero-valued voltage source would result in a potential difference of zero volts between its terminals, just as an ideal short circuit would with two leads touching. Both an open circuit and a source of current with zero value pass no current.

 

The Thévenin-equivalent resistance RTh is the resistance measured across points A and B "looking back" into the circuit. This calculator calculates the Thevenin resistance of a 3-phase full bridge rectifier.

Enter the Supply Frequency and Supply Inductance to calculate the Thevenin Resistance

  • rad./sec
    This is a required field.
  • H
    This is a required field.

Result

  • Thevenin Resistance
    ohm

Thevenin's theorem states that any linear circuit made up only of voltage sources, current sources, and resistances can be replaced by an equivalent arrangement of a voltage source (VTh) in series with a single resistance (RTh) connected across the load. This is also known as the Helmholtz-Thévenin theorem. This shortened circuit is known as the Thevenin Equivalent Circuit. Thevenin's theorem was created by French engineer Léon Charles Thévenin (hence the name). Using the Thevenin theorem, a complex electrical circuit is reduced to a simple two-terminal Thevenin equivalent circuit. In a Thevenin equivalent circuit, one Thevenin resistance and one Thevenin voltage source are connected to a load.

The resistance measured "backward" into the circuit between points A and B is the resistance to Thévenin-equivalent RTh. The resistance is measured after all sources of voltage and current have been replaced with their internal resistances. The ideal current source is an open circuit, whereas the ideal voltage source is a short circuit. Then, using the formulae for series and parallel circuits, resistance may be calculated across the terminals. Only circuits with separate sources can use this tactic. If the circuit has dependent sources, a different strategy must be used, such as connecting a test source across A and B and measuring the voltage or current through the test source.

By setting the values of the sources (voltage or current) to zero, thevenin substitutes for the sources may be remembered as a mnemonic. The source is substituted with a short circuit because a zero-valued voltage source would result in a potential difference of zero volts between its terminals, just as an ideal short circuit would with two leads touching. Both an open circuit and a source of current with zero value pass no current.

 

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