Electric Current, I - Rate of flow of electric charge, ampere, A - SI unit for electric current, I = Q/t - Formula for electric current, Electromotive Force, EMF - Work done by the electrical source in driving a unit charge around a complete circuit. , Potential Difference, PD - Work done to drive a unit charge through the component, volt, V - SI unit for voltage (both EMF and PD), V = W / Q - Formula for voltage (both EMF and PD), voltage, V - quantity that includes both EMF and PD, Resistance, R - ratio of the potential difference across a component to the current through it, ohm, Ω - SI unit for resistance, R = V / I - Formula for resistance, Resistivity, ƿ - fixed property of the wire MATERIAL , non-ohmic conductors - Does not follow Ohm's law: V and I are not proportional; I-V graphs are not straight lines, Ohmic conductors - Follow Ohm's law: V and I are proportional,

Definitions of Electrical Quantities

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