Electronic Principles
Which one of the following statements regarding ac circuits is correct?

Current lags the voltage through a resistor
All of these
Current leads the voltage through a resistor
None of these
Current and voltages are in phase through a resistor

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

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

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Electronic Principles
In a pure inductor:

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

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