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

The current in an ac circuit flows in two directions at the same time
The current in an ac circuit flows in one direction, but changes value periodically
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

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

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

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
causing an ac phase shift greater than 90 degree
None of these
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
storing 1 V for 1 second

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