Electronic Principles
Voltage is

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

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Electronic Principles
Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit flows in one direction at a steady level
The current in an ac circuit flows in two directions at the same time
None of these
The current in an ac circuit changes direction periodically

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