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ohms law

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Ohms Law  States - Resistor Colour Code Chart

The amount of current flowing in a circuit made up of pure resistances is directly proportional to the electromotive forces impressed on the circuit and is inversely proportional to the total resistance of the circuit.

Or in simpler terms!

A steady increase in voltage, in a circuit with constant resistance, produces a linear rise in current. A steady increase in resistance, in a circuit with constant voltage produces a progressively weaker current.

Ohms Law Equations

watts  = volts X amps
watts = volts squared / ohms
volts = amps x ohms
amps = volts / ohms
ohms = volts / amps

 

Band 1 and 2

Band 3

Band 4
Black

0

x 1 ohm
Brown 1 X 10 ohms
Red 2 X 100 ohms
Orange 3 X 1,000 ohms
Yellow 4 X 10,000 ohms
Green 5 X 100,000 ohms
Blue 6 X 1,000,000 ohms
Violet 7
Grey 8
White 9
Gold X 0.1 ohms +/-5%
Silver +/-10

 

 

Resistor Calculator

Note: The resistor calculator performs best using Internet Explorer 4+. 
This calculator performs incorrectly in Netscape. Sorry.

1st band 2nd band 3rd band 4th band

Ohms Law Calculator

Enter any two known values and press Calculate

Volts (E)
Amps (I)
Ohms (R)
Power (Watts)
 
(c)1998-2008 Steven Brown/Listen Hear Sound Projects , PO Box 271, Brighton, East Sussex BN50 9WZ, United Kingdom  +44(0)7778 052650