Electronic Principles
Current is

None of these
The flow of charged particles through a material
The number of free electrons in an atom
An imbalance of electrical charges
The force that causes electrons to flow

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

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Electronic Principles
Which one of the following statements best applies to a parallel RLC circuit?

None of these
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
The current waveform for each component always has the same amplitude and phase as the applied current
The sum of the current is always less than the applied current
All of these

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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
None of these
The total voltages is equal to the sum of the voltages across the resistance and inductance
The total voltage lags the total current by less than 90

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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
Inductive reactance provides the only opposition to current flow
The ac voltage lags the current by 90 degree
Combinations of resistance and inductive reactance provide any opposition to current flow

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