Electronic Principles
What is one important thing transistors do?

Amplify weak signals
None of these
Rectify line voltage
Emit light
Regulate voltage

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Electronic Principles
For a pure capacitor:

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

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Electronic Principles
A low-pass filter:

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

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