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

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

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Electronic Principles
Which one of the following statements applies to common auto batteries?

Auto batteries are primary dry-cell batteries
Auto batteries are primary wet-cell batteries
Auto batteries are secondary wet-cell batteries
None of these
Auto batteries are secondary dry-cell batteries

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Electronic Principles
The south pole of a magnet is the one:

None of these
that would be attracted to the earths north magnetic pole
that would be attracted to the earth's south magnetic pole
that would be repelled by the north pole of another magnet
that has its molecules arranged in a random pattern

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