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Unit 1.0 - ChargeCurrent

# Unit 1.0 - ChargeCurrent - Charge The fundamental electric...

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8/30/10 Dr. Bruce McCann 1 Basics Concepts and Laws Charge and Current 1 Charge The fundamental electric quantity All electrical phenomena are caused by charge Separation of charge or Motion of charge Unit: Coulomb (C) Charge of an electron: q e = -1.602 x 10 -19 C Charge of a proton: - q e = +1.602 x 10 -19 C 2 Charles Coulomb The unit of charge is the Coulomb (C) named after Colonel Charles Coulomb (1736-1806) a French engineer and physicist who published the laws of electrostatics in 1785-91. Coulomb’s Law describes the force between two charged particles. 3 Properties of Charge Charge is conserved. Charge may be transferred from one part of a circuit to another, but the total amount of charge does not change. This is a result of conservation of matter. Charge is due to electrons and protons. Electrons and protons are neither created nor destroyed in an electric circuit. 4 Current Current (i) is the rate at which charge passes through a cross sectional area: i = Δ q/ Δ t where i = the current in Amperes q = the charge in Coulombs t = the time in seconds Δ = the change in a quantity 1 Ampere = 1 Coulomb/second 1 Ampere = 6,240,000,000,000,000,000 electrons per sec (6.24 x 10 18 ) 5 André Marie Ampère The unit of current is the Ampere (A) named after André Marie Ampère (1775-1836) a French mathematician, physicist and chemist who published the electrodynamic force law in 1826.

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