EES 0836 Lecture Notes - Lecture 32: Electric Current, Electromagnetism
3 Apr 2016
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Lecture - 32: electrical interactions & simple circuits, electric forces and fields, charges in motion, batteries and bulbs, current, voltage, and power, electric charge, fundamental particles carry something called electric charge. Protons have exactly one unit of positive charge. Electrons have exactly one unit of negative charge: electromagnetic force is one of the basic interactions in nature. Like charges experience repulsive force (unlike gravity) Opposite charges attracted to each other (like gravity: electrical current is the flow of charge (electrons, charge balance, neutral atoms are made of equal quantities of positive and negative charges. Neutral carbon has 6 protons, 6 electrons, (& neutrons: electrons can be stripped off of atoms. Electrons occupy the vulnerable outskirts of atoms: usually charge flows in such a way as to maintain neutrality. Excess positive charge attracts excess negative charge. Two charges, q1 and q2, separated by distance r exert a force on each other:
