Electronic Principles
What is one important thing transistors do?

Amplify weak signals
Rectify line voltage
Emit light
None of these
Regulate voltage

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Electronic Principles
In a pure inductor:

ac current is converted to dc voltage
ac current leads the voltage by 90 degree
ac current lags the voltage by 90 degree
None of these
ac current and voltage are exactly in phase

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Electronic Principles
The north pole of a magnet is the one:

that has its molecules arranged in a random pattern
that would be attracted to the earth's north magnetic pole
that would be attracted to the earth's south magnetic pole
None of these
that would be repelled by the south pole of another magnet

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

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