Electronic Principles
A device that converts chemical energy to electrical energy is called a:

electric device
solar cell
thermocouple
chemical cell
None of these

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

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

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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
None of these
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

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