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

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

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Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

Combinations of resistance and inductive reactance provide any opposition to current flow
Inductive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow
The ac voltage lags the current by 90 degree
None of these

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Electronic Principles
What is a negative ion?

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

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