| Date: 28 April 2011, 05:34
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Without a doubt, imagining our modem world without electricity
would be difficult. More difficult would be for waterlwastewater operators
to imagine their treatment facility without electricity. Electricity pervades
our lives at every turn and its applications are myriad. It has made
possible an almost infmi e variety of tools, machinery and other equipment,
most of which we take for granted-from the simple flashlight to
incredibly complex computerized systems that operate many of our
plants. We have made ourselves almost completely dependent on it.
This text is not primarily concerned with applications, but with the
basic principles of electricity underlying all the applications. It will assist
you in gaining an understanding of the laws governing voltage, current,
resistance, and power, as well as the somewhat more complex concepts of
alternating current-the principles that are the basis for electronics. The
goal of this text is not to make electricians of anyone but to provide basic
electrical information for maintenance operators in both water and wastewater
treatment and thus give them a better understanding of the complicated
equipment found in plants.
A knowledge of the simple equations of basic mathematics is necessary
for the study of electricity and electronics. However, to make your
journey through this text less complicated we present many example
problems in simple step-by-step format. Explanations and solutions are
sufficiently detailed that the text can stand alone, making it useful for
self-study and reference.
To assure correlation to modem practice and design, we present illustrative
problems in terms of commonly used voltages and current ratings,
and cover circuits and equipment typical of those found in today's electrical
systems.
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