Electronic Principles
A circuit has two different voltage sources that are connected in a series-aiding form. If the sources are rated at 6 V and 9 V, what is the total source voltage?

16 V
7.5 V
None of these
8 V
15 V

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

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Electronic Principles
Waveforms are graphs that show:

None of these
amplitude on the vertical axis and the passage of time on the horizontal axis
amplitude on the vertical axis and frequency on the horizontal axis
the passage of time on the vertical axis and amplitude on the horizontal axis
frequency on the vertical axis and amplitude on the horizontal axis

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