resistors, how they work

Georg Simon Ohm.  He thought up one of the most important tools used by electricians all around the world, The resistor. In a schematic the resister is a zigzaged line. The resistor blocks out a certain amount of electricity letting the remaining come pass e.g. if you have a led that requires three volts and you only have a nine volt battery you would have to use a resistor that would block six volts. There are two ways to know what resistor to use.  

  ohms law states the voltage equals to current times the resistance. Which would look like. V= I x R  (the current is written like a I in this equation) so to figure out the resistance you would divide the voltage by the current e.g. V=13.6   I = 2.3. so the resistance needed is  5.91. now you need to find the right resistor.

If you look at the chart above you would notice the many numbers and colors. On a resistor there are four colors. On one side there is a silver or gold line. This tells you what tolerance it uses. The three other colors tell you how powerful it is. e.g. if the colors are red brown brown the the resistors power is equal to 210. The first color goes with the number on the chart. So red equals 2. The second number also goes with the number on the chart so brown equals 1. And the last color (the mulitiplier) adds that number which has that many zeros. So brown would be 0 if the color is red it would be 00 if white in would be 000000000.

 i think the resistor is one of the most important tools ever invented  and the most intesting. A normal switch is just a resistor being turned off and 0n. There are many types of switch resistors. I once made  a stuffed animal fish with l.e.d.s in its eyes. and its triggered by a resistor that only activates when tipped. I also have a normal switch resistor which only turns on when flipped. The schematic for a switch resistor is a normal resistor schematic but with an arrow pointing to the third zigzag. inside a resistor there are three layers the first is a carbon layer that holds it together. Then its the carbon film that covers the carbon. Last but not least the nichrome wire that conducts so much electricity its output is less then its input 


and thats how resistors work