Electronic Principles
An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

34.4 mA
28.4 mA
68.4 mA
24.2 mA
None of these

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Electronic Principles
Which one of the following statements is true for the currents in a series RC circuit?

None of these
The total current is less than the sum of the currents for the resistance and capacitance
The total current is greater than the sum of the currents for the resistance and capacitance
The current always has the same amplitude and phase for every part of the circuit
The total current is equal to the sum of the currents for the resistance and capacitance

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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
ac current is converted to dc voltage
ac current lags the voltage by 90 degree
None of these

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

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

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