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

solar cell
None of these
piezoelectric device
nicad cell
photodiode

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Electronic Principles
Which one of the following statements most accurately reflects the nature of ac power?

The current in an ac circuit flows in one direction at a steady level
None of these
The current in an ac circuit changes direction periodically
The current in an ac circuit flows in one direction, but changes value periodically
The current in an ac circuit flows in two directions at the same time

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Electronic Principles
Molecule is

The smallest particle of a substance that retains the properties of that substance
None of these
A atom that has an excessive number of electrons in its outer orbit
A atom that flows whenever there is an imbalance of electrical charges between two points
A atom that has a shortage of electrons in its outer orbit

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