One can learn more about sinusoidal through online resources such as Wikipedia. It is a complicated topic and is best explained by somebody who understands the subject. Try contacting local geography professors to find out more.
sinusoidal vs non sinusoidal
because they have more harmonics
It does not have to be. Voltage can be DC, sinusoidal, square wave, triangular wave, etc.
The main advantage of using sinusoidal waveform is that any waveform can be represented using a sinusoidal wave (by applying Fourier series). Also, analysing a circuit (or any other system) becomes simpler and easier using sinusoidal signal as test signal.
The sinusoidal signal is called a basic signal because, by Fourier Analysis, you can not further reduce it. It is one sine wave of one frequency of one amplitude of one phase. It has no harmonics. If you converted it from time domain to frequency domain you would only get one line, at the fundamental frequency.
Sinusoidal Capillaries
sinusoidal vs non sinusoidal
Sinusoidal current is not true of sinusoidal current.
excitation voltage is sinusoidal because it is taken from the terminal of alternator but excitation current is non-sinusoidal because it always dc.
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because they have more harmonics
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It does not have to be. Voltage can be DC, sinusoidal, square wave, triangular wave, etc.
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