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

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

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Electronic Principles
The period of a waveform is:

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

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The amount of magnetic flux that is not confined to the core material of an electromagnet
The force of attraction between the poles of a permanent and temporary magnetic field
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The circular magnetic field that surrounds a conductor carrying a current
None of these

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