Calculate Resistor Values from Color Codes
The information booklet contained in many of the iBotz robots explains how many of the electrical components used to
control the iBotz robots work.
One of the most widely used components is a resistor. Resistors
are used to resist the flow of electricity in a circuit.
The value of a resistor is given by the coloured bands on the
the case of the resistor. Because it is very difficult to make
large numbers of resistors with a very exact resistance value
cheaply, manufacturers also give a tolerance value to let you
know how close the actual value of the resistor is guaranteed
to be to the value the bands saty it should be.
The coloured bands on the resistor are used to encode the resistance
value and tolerance of the resistor, The first two bands describe
the value, the third band a multiplier value, and the fourth
band gives the tolerance.
You can use the interactive tool below to identify the resistance
of the resistor, as well as its tolerance.
Illustration Copyright 1996 Danny Goodman (AE9F).
All Rights Reserved.
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GRAPHICAL RESISTANCE CALCULATOR in JAVASCRIPT
Version 2.2
by Danny Goodman, AE9F (www.dannyg.com)
Analyzed and described at length in
JavaScript Bible
This program is Copyright 1996, 2001 by Danny Goodman. You may adapt
this calculator for your Web pages, provided these opening credit
lines (down to the lower dividing line) are in your outliner HTML document.
You may not reprint or redistribute this code without permission from
the author.
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There is an excellent web-based tutorial on resistance and how resisotrs work at
the Molecular Expressions™ website - enter
the word capacitance in to the search box, and then click on the link headed: Electricity and Magnetism: Resistance
Go back to the http://robots.open.ac.uk website.
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