Electronic Principles
Current is

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

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Electronic Principles
What is a free electron?

An electron that has no electrical charge
An electron that has been freed from its parent atom
An electron that costs nothing
None of these
An electron that has twice the amount of charge of a normal electron

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

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 two directions at the same time
The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit changes direction periodically

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