Electronic Principles
To get the Thevenin voltage, you have to

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

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Electronic Principles
A low-pass filter:

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

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