Electronic Principles
A device that converts thermal energy to electrical energy is called a:

chemical cell
piezoelectric devices
None of these
thermocouple
solar cell

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Electronic Principles
A high-pass filter:

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

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Electronic Principles
When applying a square waveform to a capacitor, the circuit tends to:

None of these
peak the current and round off the voltage waveforms
round off both the voltage and current waveforms
peak both the voltage and current waveforms
peak the voltage and round off the current waveforms

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Electronic Principles
Which one of the following is a statement of KirchhofFs voltage law?

The total voltage in a parallel circuit is less than the value of the smallest voltage
None of these
The algebraic sum of voltages entering and leaving a point is equal to zero
The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it
The algebraic sum of voltages in a loop is equal to zero

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