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This Concept Map, created with IHMC CmapTools, has information related to: 13&14, electromotive force, emf is measured in volts, V, Energy can be obtained from battery, cell, Energy can be obtained from Power Stations, current is measured in ampere, A, protons are positive charge, electrons are negative charge, Resistance is affected by cross-sectional area, circuit can be arranged in series, current is the rate of flow of charge, Electricity is flow of current, Electricity is a form of Energy, circuit can be arranged in parallel, Potential Difference move charges through a device circuit, Ohm's law is valid in constant temperature, Energy provides Potential Difference, Ohm's law is about current, Resistance is measured in ohms, Ω, Energy provides electromotive force, emf, Resistance is affected by resistivity, Resistance can vary in Variable resistors