Internal resistance is the resistance offered by________________?
Correct answer: A. source of EMF
- A. source of EMF
- B. conductor
- C. resistor
- D. capacitor
Explanation
Internal resistance is the resistance inside a cell or other source of EMF, caused by its electrolyte and internal materials. Option b, conductor, is a likely choice because a connecting wire also opposes current, but that is external resistance rather than internal resistance.
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About Internal Resistance of Sources
Internal resistance is the opposition to current inside a cell or other source, causing terminal voltage to fall below its emf when current flows. Questions use E = V + Ir, current in complete circuits, lost volts, source combinations, and the difference between internal resistance and the external load resistance.
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