Electronic Principles
Waveforms are graphs that show:

amplitude on the vertical axis and frequency on the horizontal axis
None of these
frequency on the vertical axis and amplitude on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
amplitude on the vertical axis and the passage of time on the horizontal axis

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Electronic Principles
One henry of inductance is defined as:

the number of turns of wire in an inductor multiplied by the amount of current flowing through it
the amount of counter emf required to reduce a current to 1 A
the amount of inductance required to change the frequency of a current by 1 Hz
the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
None of these

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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
None of these
Resistances provide the only opposition to current flow
The ac voltage lags the current by 90 degree

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