A sine wave is a simple vertical line in the frequency domain because the horizontal axis of the frequency domain is frequency, and there is only one frequency, i.e. no harmonics, in a pure sine wave.
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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.
Range: The range is the set of all possible output values (usually y), which result from using the function formula. Domain: The domain of a function is the set of all possible input values (usually x), which allows the function formula to work.
The symbol for a diode is a horizontal line with an arrow pointing to an intersecting vertical line, the horizontal line continues on the other side of the vertical line.
line Frequency diode have very low forward bias drops but their recovery characteristic(time) is very long. Their softness factor is low.
the delay line is used to delay the incoming signal vertical information and synchorized it with the horizontal