Electronic Principles
Current and voltage are said to be in phase when:

their waveforms are both ac or both dc
All of these
None of these
they have the same amplitude and frequency
their waveforms cross through zero and reach positive and negative peaks at the same time

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Electronic Principles
The period of a waveform is:

the time required to complete one full cycle
None of these
the number of cycles completed in one second
equal to 0.707 times the peak amplitude
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 statements is true for the voltages in a series RC circuit?

The voltage always has the same amplitude and phase for every part of the circuit
The total voltage is greater 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 total voltage is less than the sum of the voltages across the resistance and capacitance

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