Electronic Principles
Suppose the zener diode has a breakdown voltage of 10 V and zener resistance of 8.5 W, what is the additional voltage when the current is 20 mA?

0.17 V
18.8 V
20 V
None of these
10.17 V

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Electronic Principles
A high-pass filter:

has no effect on ac signals
None of these
passes lower-frequency signals and reduces higher-frequency signals
passes higher-frequency signals and reduces lower-frequency signals
increases the level of all frequencies by a significant amount

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

The total current is less than the sum of the currents for the resistance and capacitance
None of these
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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