Electrical Engineering › Section C · Series circuits › Topic C.2
Kirchhoff's voltage law
Walk around any closed loop in a circuit and you arrive back at the potential you started from. Kirchhoff's voltage law turns that simple fact into an equation that finds unknown voltages, often without knowing a single resistance.
In this topic
- The law and why it holds
- Loops and directions
- Polarity, not element type
- Worked example: a missing voltage
- Voltage across a gap
- When the polarity is unknown
- Worked example: a negative answer
- KVL with Ohm's law
- Interchanging series elements
- Where KVL applies
- Common mistakes to avoid
- Key takeaways
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