alleryStart learning →All voltage sources are described as having two fundamental parts: an internal resistance and a:
ABuilt-in current meter
BSource of electrical energy
CSecond external resistor
DFixed mechanical switch
Answer & Solution
Correct answer: B. Source of electrical energy
1. A real battery is not an ideal source.
2. Output voltage falls for depleted or overloaded batteries.
3. The reason is that all voltage sources have two fundamental parts.
4. They are a source of electrical energy and an internal resistance.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 21 'Circuits and DC Instruments', sections 21.1-21.6_
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