Electronic Principles
What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?

692.2 Ohm
3890 Ohm
844.5 Ohm
1234 Ohm
None of these

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

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
Like magnetic poles repel, while unlike poles attract
None of these

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Electronic Principles
Current is

An imbalance of electrical charges
The force that causes electrons to flow
The flow of charged particles through a material
None of these
The number of free electrons in an atom

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
an increase in current through the coil causes no further increase in the mmf
the core is permitted to move freely within the coil
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these

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