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

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
A conductor allows current to flow much easier than an insulator does
None of these
An insulator allows current to flow much easier than a conductor does

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Electronic Principles
In a pure inductor:

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

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Electronic Principles
When applying a square waveform to a capacitor, the circuit tends to:

peak the current and round off the voltage waveforms
None of these
round off both the voltage and current waveforms
peak both the voltage and current waveforms
peak the voltage and round off the current waveforms

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