Electronic Principles
Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

The voltage remains at one polarity and at a steady level
The voltage causes current to flow in two directions at the same time
None of these
The voltage remains at one polarity but changes value periodically
The voltage reverses polarity periodically

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Electronic Principles
Voltage is

Trie force that causes electrons to flow
The flow of charged particles through a material
The smallest electrically charged particle
The number of free electrons in an atom
None of these

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