Electronic Principles
To get the Thevenin voltage, you have to

None of these
Open the voltage source
Short the load resistor
Open the load resister
Short the voltage source

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Electronic Principles
A high-pass filter:

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

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