Electronic Principles
An ideal voltage source has

None of these
Infinite internal resistance
A load dependent voltage
Zero internal resistance
A load-dependent current

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

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

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

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