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
Which one of the following phrases best describes residual magnetism?

None of these
The force of attraction between the poles of a permanent and temporary magnetic field
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The circular magnetic field that surrounds a conductor carrying a current
The amount of magnetic flux that is not confined to the core material of an electromagnet

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

The total voltage is less than the sum of the voltages across the resistance and inductance
The voltage always has the same amplitude and phase for every part of the circuit
The total voltages is equal to the sum of the voltages across the resistance and inductance
None of these
The total voltage lags the total current by less than 90

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Electronic Principles
Which one of the following statements applies to common, non-rechargeable flashlight batteries?

Common flashlight batteries are primary dry-cell batteries
None of these
Common flashlight batteries are secondary wet-cell batteries
Common flashlight batteries are primary wet-cell batteries
Common flashlight batteries are secondary dry-cell batteries

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Electronic Principles
What is the difference between a conductor and an insulator?

A conductor allows current to flow much easier than an insulator does
An insulator allows current to flow much easier than a conductor does
The difference between conductors and insulators depends on how they are used
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
None of these

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