Electronic Principles
Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it?

None of these
I = E/R
I = ER
E = I2R
E = PR

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Electronic Principles
What is a free electron?

None of these
An electron that has twice the amount of charge of a normal electron
An electron that has been freed from its parent atom
An electron that has no electrical charge
An electron that costs nothing

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

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

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

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