AC Circuits
Notes
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See all →- How is a sinusoidal alternating voltage generated by a coil rotating in a magnetic field? In one line When a coil rotates at constant speed in a uniform magnetic field, the flux linking it changes continuously, so by Faraday's law... 1
- What do cycle, time period, frequency, amplitude and instantaneous value mean for an AC wave? In one line These are the basic terms that describe a repeating AC waveform: how big it gets (amplitude), how long one repetition takes (tim... 1
- What is the RMS value of an alternating current and why is it 0.707 times the peak? In one line The RMS (root mean square) value of an alternating current is the steady DC current that would produce the same heat in a resist... 1
- What is the average value of a sine wave, and how are form factor and peak factor defined? In one line The average value of a sine wave over a half cycle is 2V_m/π ≈ 0.637V_m ; form factor is RMS ÷ average (1.11) and peak factor is... 1
- What is a phasor, and how do you find phase difference between two AC quantities? In one line A phasor is a rotating line whose length represents the RMS (or peak) value of a sinusoid and whose angle represents its phase,... 1
- How do you add or subtract sinusoidal AC quantities using phasors and complex numbers? In one line To add or subtract sinusoids of the same frequency, write each as a phasor in rectangular form (a + jb) , add or subtract the re... 1