Practice question · True or false
The terminal voltage of a real battery equals its EMF only when it delivers no current.
Hints
- What does the internal resistance do once current flows?
- It drops I times r inside the source itself.
Show the answer
True
Why
True, the terminal voltage is , which equals only at . This is why a tired battery reads fine on an unloaded meter and collapses under load.
Practise Steady Currents and Circuits
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