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The difference between an alternating current and a continuous current is that the continuous current flows only on one direction.
The alternating current circulates first in one direction and then on the opposite one, repeating this process continously.
This is the kind of electric current that we have in our houses to use the TV, the stereo, the washing machine, the refrigerator, etc..
The following picture shows the magnitud variation of a voltage (which is also alternating).
First it goes up and then down and it gives us a sine waveform. (it behaves the same way as the current)
 This voltage (and current) varies continuously and we can use the formula:
V = Vp x Sin(Θ) to know the voltage at a specific time
Note:
Θ
= wt = 2πft
where:
π = 3.1416
f = frecuency
t = time.
The Vp (see the picture) is the maximum value of the wave and
Θ is the angular distance that is measured in degrees.
Looking at the last picture, we see a periodic sine wave (the wave form repeats continuously) and a complete cycle of this sine wave has 360 degrees.
We can find the voltage magnitud at any time with the above formula.
For each angular distance Θ there is a different voltage. Where in some cases it`s positive and in others negative (when it reverses its polarity.)
Related Links
- Benjamin Franklin`s Fluid Theory
- The electric power transformer
- Static electricity
- Light-emitting diode connected to 120/240 VAC
Properties of Alternating Current >>
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