Electronic Principles
Voltage is

The flow of charged particles through a material
The number of free electrons in an atom
The smallest electrically charged particle
Trie force that causes electrons to flow
None of these

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Electronic Principles
What is the difference between a conductor and an insulator?

A conductor allows current to flow much easier than an insulator does
An insulator allows current to flow much easier than a conductor does
None of these
The difference between conductors and insulators depends on how they are used
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

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Electronic Principles
For a pure capacitor:

ac current is converted to dc voltage
ac current leads the voltage by 90 degree
None of these
ac current lags the voltage by 90 degree
ac current and voltage are exactly in phase

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