Alexander Fufaev

Formula: Practical (Real) Voltage Source

Circuit with a Practical Voltage Source

Terminal Voltage

Unit
Electrical voltage of an ideal voltage source MINUS the voltage across the internal resistance \(R_{\text i}\).

It can be seen from the formula that the terminal voltage depends on both the internal resistance of the voltage source and the load resistance.

Source voltage

Unit
Voltage of an ideal voltage source - by definition, it has infinite resistance.

Internal resistance

Unit
Resistance of a practical (real) voltage source.

Load resistance

Unit
Electrical resistance connected to the terminals (to which the terminal voltage is applied). The terminal voltage and source voltage are equal when the internal resistance is zero.