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

piezoelectric devices
thermocouple
solar cell
None of these
chemical cell

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Electronic Principles
When a parallel RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
the difference between inductive and capacitive reactance is equal to the resistance
None of these
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance

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

The voltage always has the same amplitude and phase for every part of the circuit
None of these
The total voltage is equal to the sum of the voltages across the resistance and capacitance
The total voltage leads the total current by less than 90 degree
The total voltage is less than the sum of the voltages across the resistance and capacitance

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