Electronic Principles
If a load resistance is 1 kW, a stiff voltage source has a resistance of

Less than 100 k Ohm
None of these
At least 10 Ohm
More than 100 k Ohm
less than 10 Ohm

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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
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
None of these
The voltage always has the same amplitude and phase for every part of the circuit

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Electronic Principles
The period of a waveform is:

None of these
the time required for the voltage to rise from 10% to 90% of the peak amplitude
equal to 0.707 times the peak amplitude
the time required to complete one full cycle
the number of cycles completed in one second

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Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles attract, while unlike poles repel
Current flowing through a conductor generates a magnetic field
Like magnetic poles repel, while unlike poles attract
None of these

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