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

7.5 V
None of these
16 V
8 V
3 V

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Electronic Principles
In a pure inductor:

None of these
ac current and voltage are exactly in phase
ac current lags the voltage by 90 degree
ac current is converted to dc voltage
ac current leads the voltage by 90 degree

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Electronic Principles
What is the difference between a conductor and an insulator?

None of these
An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
A conductor allows current to flow much easier than an insulator does
An insulator allows current to flow much easier than a conductor does
The difference between conductors and insulators depends on how they are used

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