What is resistance?
Resistance is the opposition to the flow of electrons in a circuit through a conductor.
In the illustration below, electrons flow in a synchronized and orderly manner.
In reality the atoms will not be aligned so well and they will also vibrate tiny amounts causing electrons to collide. As the electrons collide they convert their kinetic energy into heat and light. That’s how old incandescent filament bulb’s work.
Some materials simply do not have enough atoms to allow electrons to flow. Other materials do not have enough free electrons available to allow electrons to flow. These are not good conductors of electricity.
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