Electronic Principles
Current can flow through a normally open push button switch as long as:

None of these
its contact remain open
you are not pressing the button
you are pressing the button
its contact remain open

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

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

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Electronic Principles
Which one of the following statements is true for the voltages in a series RL circuit?

The total voltage is less than the sum of the voltages across the resistance and inductance
The voltage always has the same amplitude and phase for every part of the circuit
The total voltage lags the total current by less than 90
None of these
The total voltages is equal to the sum of the voltages across the resistance and inductance

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