they have an infinite energy
It does not have to be. Voltage can be DC, sinusoidal, square wave, triangular wave, etc.
A sinusoidal signal.
They are the same thing.
if the speedometer works off of an input wave (sinusoidal signal) you would think the signal generator would be a source of reference
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.
As a sinusoidal signal is clipped the waveform approaches a square wave.
You may use a filter which will round off the square pulse to sine wave.The higher order the filter the better the SINE wave . The Square pulse and the sine wave must both be tuned to our required frequency
To determine the amplitude of a sinusoidal signal, we look at the peak value of the signal function. The amplitude is the half of the peak-to-peak value of the signal, or the absolute value of the maximum value of the signal.
You have to excite it with a sinusoidal signal then measure the current or voltage
SInusoidal oscillators have a wide range of applications including usage in radios, televisions, communication systems, computers, industrial controlled applications, and laboratories. They work as as a function or signal generator.
sinusoidal vs non sinusoidal
A true pure sinusoid signal lasts forever, from -infinity to +infinity. If it ever turned on or off it would not be a pure single frequency sinusoid signal. Real signals aren't pure.