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
None of these
The current in an ac circuit changes direction 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

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Electronic Principles
The dielectric constant of a material is a measure of:

how well the material concentrates magnetic lines of force
the amount of voltage it can withstand before breaking down
the amount of opposition to the current flow
how well the material concentrates electrostatic lines of force
None of these

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