Electrical Engineering › Section C · Series circuits › Topic C.4
Internal resistance and voltage regulation
Connect a heavy load to a real battery or supply and its terminal voltage sags. Modelling the source as an ideal voltage with a small resistance inside explains the sag, predicts it, and gives a single figure, voltage regulation, for how close a supply comes to ideal.
In this topic
- Real sources sag
- The model of a real source
- Terminal voltage under load
- Worked example: finding R_int
- The voltage-current line
- Power lost inside the source
- Worked example: a battery with known R_int
- Voltage regulation
- Regulation and internal resistance
- Worked example: a 5 V supply
- Common mistakes to avoid
- Key takeaways
This topic is part of Wuanberri Pro. Checking your access…