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 flows in two directions at the same time
The current in an ac circuit changes direction periodically
The current in an ac circuit flows in one direction at a steady level

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Electronic Principles
What is a negative ion?

An atom that contains more protons than neutrons
An atom that contains more protons than electrons
None of these
An atom that contains more electrons than protons
An atom that contains more electrons than neutrons

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

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