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Electricity is the behavior of electric charge, and electric charge is an intrinsic property of some particles (it'd be like asking what mass is, without fallin
by OkayPhysicist 4y ago
Electricity is the behavior of electric charge, and electric charge is an intrinsic property of some particles (it'd be like asking what mass is, without falling back on what mass does).
Electric charge has a magnitude (arbitrarily, we have labeled the axis such that protons are positively charged and electrons are negatively charged, but it's symmetric such that if everything in the universe swapped positive to negative nothing would change). Particles with opposite charges attract, particles with same charges repel. When a source of positive charge and a source of negative charge are separated, there is potential energy. We simplify our math a bit by factoring out the charge that would be moving from the positive to the negative out of our potential energy calculation to get "electric potential" or simply "voltage". When there is a path that charge can flow through between a high potential and low potential, it creates a flow of charge between positive and negative sources of charge that we call "current". As the charge flows, the potential energy decreases, meaning other energy has to be released. The most common way this happens is simply by creating heat. Some materials allow charge to flow through them more easily than others: the ratio of the potential (voltage) across a component to the rate of electric charge that flows through it as a result (current) is approximately constant for most things, and we call that resistance. This gives us Ohms law : V = IR