Cycles Per Second (CPS)
So far, we know that electricity can flow as AC or DC. Who said the flow must be continuous? It doesn't have to be. Further, there is no law of nature that demands that voltage remain constant. It is technically possible to vary the number of oscillations between positive and negative sweeps in AC, and to vary the amount of DC current or even turn it on and off to create pulses.
When you have an AC current the number of sweeps between positive and negative is measured in Cycles Per Second (CPS). Electricity in North America is delivered at 60 CPS, with the pressure of 120 volts. Sometimes this is expressed as 120VAC. In Europe, the standard is 50 CPS and 240VAC. In computers, we describe CPS using Hertz, or Hz. A device that operates at 1000 CPS is running at 1KHz.
Taking DC and turning it on and off, or, pulsing the voltage is the basis for a digital signal. For example, 5VDC could be a one, and 1VDC or even a negative voltage could signify a zero.
With the basics of electrical properties complete, let's look at a few electronic components.
Home - Table Of Contents - Contact Us
CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
Version 1.0 - Version Date: December 6, 2004
Adapted with permission from a work created by Tcat Houser.
CertiGuide.com Version © Copyright 2004 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.