### Re: How does the # of windings in a coil relate to the voltage produced.

Date: Mon Jul 10 12:51:27 2000
Posted By: Michael L. Roginsky, Staff, Avionics, Honeywell Defense Avionics
Area of science: Engineering
ID: 962735235.Eg
Message:

Hello Nick: Yes it would. Let us look at the basics, using transformers for
an example:

Transformers are devices that transfer electric energy from one
alternating-current circuit to one or more other circuits. These devices
are used to increase (step up), reduce (step down) or simply isolate the
voltage source from the output source. Notice that transformers can only be
used in alternating current circuits.

Transformers change voltage through electromagnetic induction as the
magnetic lines of force (flux lines) build up and collapse with the changes
in current passing through the primary coil, current is induced in another
coil, called the secondary. The secondary voltage is calculated by
multiplying the primary voltage by "turns ratio". This ratio is simply the
number of turns in the secondary coil divided by the number of turns in the
primary coil. Transformers are employed for widely varying purposes:

1. To reduce the voltage of conventional power circuits to operate
low-voltage devices, such as doorbells and toy electric trains.

2. To raise the voltage from electric generators so that electric power can
be transmitted over long distances.

3. Isolate circuits for reasons of safety (isolate a piece of equipment
from the source of power) or to eliminate ground potential differences that
may affect measurements.

4. To match impedance of source to the load, maximizing the transfer of
power.

Look up on the Internet:
http://www.sweethaven.com/acee/forms/frm0502.htm
http://www.tpub.com/neets/book2/5f.htm
http://www.latech.edu/~yates/et360w1.htm

It is also possible to convert one DC voltage to another. This is commonly
done by first converting the DC to AC using an oscillator circuit, then
rectifying the AC back to DC. Here is a website to visit:
http://www.theallpower.com/tech/techart.htm

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