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

None of these
photodiode
piezoelectric device
nicad cell
solar cell

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Electronic Principles
Which one of the following statements most accurately describes the nature of inductive reactance?

Inductive reactance is an opposition to current flow in dc circuits
Inductive reactance is an opposition to current flow in ac circuits
None of these
Inductive reactance is another term for counter emf
Inductive reactance is a force that tends to overcome the effects of counter emf

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