Voltage divider equation8/30/2023 When a voltage is applied across the pair, the output voltage is some fraction of the input voltage: But most often, it’s two discrete fixed resistors. Physically, this is occasionally implemented as a potentiometer, which splits a single physical resistor in two with a physically moveable conductive center contact. When you see an experienced electrical engineer take a quick glance at an analog schematic and quickly identify what’s going on, they’re most likely doing voltage divider approximations in their head – sometimes without realizing it!Īn ideal voltage divider is just two resistors in series. (Because more complicated subcircuits can be approximated as a single resistor, the term and techniques here can also apply more broadly beyond just resistors.) We’ll start with the ideal case, look at the non-ideal case, and then show when approximations are useful in design and analysis. While the math of solving these circuits has been covered in previous sections, voltage dividers have earned their own name because they appear often enough to be a useful shortcut when analyzing many larger circuits. Voltage dividers are just particular combinations of resistors in series when connected to ideal voltage and current sources. Extremely common 2+ resistor configuration.
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