Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

More than 100 k Ohm
None of these
At least 10 Ohm
Less than 100 k Ohm
Less than 10 Ohm

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Electronic Principles
Molecule is

A atom that flows whenever there is an imbalance of electrical charges between two points
A atom that has a shortage of electrons in its outer orbit
The smallest particle of a substance that retains the properties of that substance
A atom that has an excessive number of electrons in its outer orbit
None of these

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
None of these
Hysteresis is most apparent when the core material is saturated
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet

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Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

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

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Electronic Principles
For a pure capacitor:

None of these
ac current and voltage are exactly in phase
ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree
ac current is converted to dc voltage

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