Electronic Principles
What is the smallest number of polarities required for current flow?

Two - a negative terminal and a positive terminal
One - a negative terminal
Four - two negative and two positive
Three - negative, positive and neutral terminals
None of these

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Electronic Principles
In a pure inductor:

ac current is converted to dc voltage
ac current lags the voltage by 90 degree
ac current leads the voltage by 90 degree
None of these
ac current and voltage are exactly in phase

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Electronic Principles
What is a free electron?

An electron that has twice the amount of charge of a normal electron
An electron that costs nothing
An electron that has no electrical charge
None of these
An electron that has been freed from its parent atom

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

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