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

solar cell
thermocouple
None of these
chemical cell
piezoelectric devices

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Electronic Principles
Which one of the following statements is true for the voltages in a series RC circuit?

The total voltage is greater than the sum of the voltages across the resistance and capacitance
None of these
The voltage always has the same amplitude and phase for every part of the circuit
The total voltage is less than the sum of the voltages across the resistance and capacitance
The total voltage is equal to the sum of the voltages across the resistance and capacitance

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

The ac voltage leads the current by 90 degree
Resistances provide the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow
Capacitive reactance provides the only opposition to current flow
None of these

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