Charge and Current 0.0 / 5 ? PhysicsD.C. ElectricityASOCR Created by: AntoniadfCreated on: 04-04-17 11:30 Electric Current The rate of flow of charge. 1 of 12 Electric charge Physical property, Q either positive or negative measured in Coulombs. 2 of 12 Coulombs Unit of electical charge, 1 coulomb of charge passes a point in one second where there is a current of 1 amp. 3 of 12 Amperes 1 amp is one coulomb per second. 4 of 12 Elementary charge The charge on a proton, 1.6x10-19C 5 of 12 Conventional current Movement of current from positive to negative (the direction the positive charges would travel). 6 of 12 Resistance Property of a material calculated by dividing potential difference by current, measured in ohms. 7 of 12 Conservation of charge Electric charge cannot be created or destroyed - the total charge in any interaction must be the same before and after. 8 of 12 Kirchhoff's 1st Law At any point in an electrical circuit, the sum of currents into a point is equal to the sum of currents out of that point, charge is conserved. 9 of 12 Number density The number of free electrons per cubic metre of material (m-3). 10 of 12 Semiconductors A material with a lower number density than a conductor. 11 of 12 Mean drift velocity The average velocity of electrons as they move through a wire (ms-1). 12 of 12
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