Abra AK-10, Руководство пользователя

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5
Thoery of Operation
Ac Signal
Your power plant step down transformers supplies to your home 220-240 volts RMS AC (Alternating
Current), this signal is comprised of sine waves.
A sine wave can be interpreted as a sway, it moves up and down like a wave in the ocean. Below is
a graphical representation of a sine wave.
The furthest point away from the middle line is called Voltage Peak (Vpeak), either positive peak
(upper half from middle line) or negative peak (lower half from middle line), the distance between
them is referenced as a peak to peak voltage (Vpeak - Vpeak).
A period is the time lapse for something to be completed, sine waves will start at different ranges
or degrees but they often come back to where they started. For example the figure below, the
voltage offset is 0 volts. The sine wave starts at 0 volts and will end at 0v, the length of this period
is 2π or 360°.
If you analyze the previous graph, you may notice something on the y-axis called t time in Radians.
The y-axis represent time, the only confusion is “in radians”. The reason why the units are in
radians is because the sine wave is essentially a circle and radians are the mathematical method of
representing in numerical values that are easy to work with.
The usage of degrees is not a practical approach in measuring the period of any signal. Degrees
give an approximation value similar to percentage, whereas radians give us values to work with
similar to decimal points.
An example of using radians to derive the relation of degrees in a sine wave.