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Resistance & Ohm’s Law

Resistance & Ohm’s Law. E move through metals relatively easily, but it is not “frictionless” There is resistance to movement Work must be done as charges move E must have energy to start  an electric potential. Experiments show: V α I

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Resistance & Ohm’s Law

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  1. Resistance & Ohm’s Law • E move through metals relatively easily, but it is not “frictionless” • There is resistance to movement • Work must be done as charges move • E must have energy to start  an electric potential

  2. Experiments show: V α I • the constant that creates an equality = resistance, R  V = I R • Ohm’s “Law” R = V / I  unit: V/A = ohm, Ω

  3. Not all materials are linear between voltage & current = nonohmic • Since it does not apply to all ≠ a law

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