Resistors are often made from wire-wound coils or pieces of carbon. Rheostats and potentiometers are variable resistors.
Prior knowledge and Internet research indicates that a Georg Simon Ohm was one of the forefathers of research into electrical resistance.
“Ohm, Georg Simon
Ohm, Georg Simon, 1789-1854... displayed 300 characters
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German physicist best known for Ohm's Law, the basic law of current flow. Educated in science by his father, a master locksmith, he worked as a schoolteacher before deciding to devote himself to research in physics. He began the studies leading to the formulation of his law in 1825 and discovered that the force of a current traveling through a conductor is a measure of the current... displayed next 300 characters
A resistor transforms the electrical energy of the charges into heat.
The unit used to measure resistance is called the Ohm ( ) it is a measure of how many volts are needed to push 1 amp through the component...
The points are very close to the line of best fit or even touching it. This showed that the results were directly proportional throughout the experiment, as the line does not curve suddenly or curve or bend at all in any way, as the gradient of the line stayed the same throughout...
The theory behind these conclusions are:
As the length doubles the resistance doubles. Resistance is caused by electrons bumping into ions. If the length of the wire doubles, the electrons bump into the ions twice as much so the resistance will double...
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