The sine wave, with its repeating pattern, can represent a single frequency with no harmonics.
yes
we cannot use transformer because transformer cannot change frequency . . .
By shifting the sine wave by 45 degrees.
Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered.
It is more reasonable to use square wave rather than sine wave signal to determine slew rate. Both signal sources serve as a functional generator with the sine wave providing high purity waves.Ê
A sine wave is the graph of y = sin(x). It demonstrates to cyclic nature of the sine function.
There is more than one technique. The most common is to use an electronic switch to convert the DC into a square wave, the square wave is filtered to make it a (rough) sine wave. This can then passed through a transformer to the desired voltage. The advantage of this system is that it is very efficient, the disadvantage is that the sine wave produced isn't all that good a sine wave and some devices (AC motors, for example) sometimes have problems when being powered by inverters. An alternative is to use an oscillator to produce the sine wave. This produces a better sine wave, but is less efficient.
The voice is not a sine wave.
By its very mane, a sinusoidal wave refers to a sine function. The cosine function is simply the sine function that is phase-shifted.
a phase shifted sine wave of a different amplitude.
cos wave
A sine wave has no harmonics. It only has a fundamental, so the value of the 2nd, 3rd, and 12th harmonics of a sine wave is zero.