Electronic Principles
Suppose a voltage source has an ideal voltage of 15V and a source resistance of 0.2W. For what values of load resistance will the voltage source appear stiff?

10 Ohm
30 Ohm
None of these
20 Ohm
100 Ohm

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Electronic Principles
A high-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
None of these
has no effect on ac signals
passes higher-frequency signals and reduces lower-frequency signals
increases the level of all frequencies by a significant amount

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Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a positive charge and a proton has a negative charge
An electron has a positive charge and a proton has no charge
None of these
An electron has a negative charge and a proton has a positive charge
An electron has a negative charge and a proton has no charge

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

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

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