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

solar cell
piezoelectric device
photodiode
nicad cell
None of these

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Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a positive charge and a proton has a negative charge
An electron has a positive charge and a proton has no charge
An electron has a negative charge and a proton has a positive charge
An electron has a negative charge and a proton has no charge
None of these

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