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

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

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Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

None of these
An electron has a negative charge and a proton has a positive charge
An electron has a positive charge and a proton has a negative charge
An electron has a negative charge and a proton has no charge
An electron has a positive charge and a proton has no charge

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
None of these
Hysteresis is most apparent when the core material is saturated
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet

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