Electronic Principles
Current and voltage are said to be in phase when:

None of these
their waveforms are both ac or both dc
their waveforms cross through zero and reach positive and negative peaks at the same time
All of these
they have the same amplitude and frequency

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

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