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

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

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Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
the difference between inductive and capacitive reactance is equal to the resistance
None of these
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance

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Electronic Principles
What is a negative ion?

An atom that contains more electrons than protons
An atom that contains more protons than electrons
None of these
An atom that contains more protons than neutrons
An atom that contains more electrons than neutrons

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Electronic Principles
The total inductive reactance of a parallel inductor circuit is:

equal to the sum of the individual inductance values
None of these
equal to the source voltage divided by total current
less than the inductance value of the smallest inductor
equal to the sum of the individual inductive-reactance values

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