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?

400 Ohm
310 Ohm
410 Ohm
None of these
550 Ohm

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Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

Like magnetic poles attract; unlike poles repel
Current flowing through a conductor generates a magnetic field
None of these
Like magnetic poles repel; unlike poles attract
Current is induced in a conductor that is moving through a magnetic field

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Electronic Principles
Voltage is

The flow of charged particles through a material
Trie force that causes electrons to flow
The number of free electrons in an atom
The smallest electrically charged particle
None of these

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