At first, these resistors are made from rugged carbon material wrapped around the wire which is then marked with color-coded bands shaped and reading can be seen in the table are color coded. Type of resistor is also a type of resistor early generations after the resistor wire.
Now it's rare to be used on the circuit - electronic circuit. The shape of this type resistor can be seen in the picture on the side.
http://world-electricity.blogspot.com/2013/01/resistor-carbon-trunk-arang.html
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