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

chemical cell
electric device
solar cell
None of these
thermocouple

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Electronic Principles
Which one of the following phrasers best describes flux density?

The concentration of lines of magnetic force
The force that maintains lines of force
The rate of change of the number of lines of magnetic force
None of these
The opposition to a build-up of magnetic fields

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