Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

a battery
an insulator
a conductor
None of these
a piece of copper wire

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Electronic Principles
Current is

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

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

Resistances provide the only opposition to current flow
The ac voltage leads the current by 90 degree
None of these
Capacitive reactance provides the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow

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