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 at a steady level
The current in an ac circuit flows in one direction, but changes value periodically
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

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
storing 1 V for 1 second
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
None of these
causing an ac phase shift greater than 90 degree

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

that would be repelled by the north pole of another magnet
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 has its molecules arranged in a random pattern

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