Electronic Principles
Current is

The number of free electrons in an atom
The force that causes electrons to flow
The flow of charged particles through a material
An imbalance of electrical charges
None of these

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

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