Electronic Principles
A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

410 Ohm
310 Ohm
None of these
400 Ohm
550 Ohm

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Electronic Principles
What is a free electron?

An electron that has been freed from its parent atom
An electron that has no electrical charge
An electron that has twice the amount of charge of a normal electron
An electron that costs nothing
None of these

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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
The total capacitance of a series capacitor circuit is:

None of these
less than the value of the smallest capacitor
equal to the sun of the individual capacitive-reactance values
equal to the sum of the individual capacitance values
equal to the source voltage divided by total current

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