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

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

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Electronic Principles
For a pure capacitor:

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

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Electronic Principles
A high-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals
increases the level of all frequencies by a significant amount
None of these
passes higher-frequency signals and reduces lower-frequency signals

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