MadSci Network: Engineering

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

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 

Look up on the Internet:

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:

Your MAD.SCI Micro.

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