Circuit Analysis for Complete Idiots Quotes

“Conductors have tons of free electrons and they keep moving in random direction (due to thermal energy), and each of these small movements contribute to an Electric current. You might be thinking, if an electric current is produced this easily in a conductor, why do we need batteries and generators and power plants and stuff. Can’t we just hook up a small piece of copper wire to a bulb and be done with it. Unfortunately, that won’t work. That’s because the currents produced by each free electron are in random direction (in accordance with the direction of their motion) and when we consider the conductor as a whole, these currents cancel each other out and net current is zero.”
― David Smith, Circuit Analysis for Complete Idiots