Electronic Principles
Current is

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

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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
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
None of these

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