Electronic Principles
Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?

Number of lines of force
None of these
Flux density
Reluctance
Magnetomotive force

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

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

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

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

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