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The rate of flow of charges dQ (C) I (A) = -------- dt (s) in ionised gases - Both free electrons and positive ions can flow - Current is the sum of electron- current and ion-current - I = I(-) + I(+), Electricity is about Current - SI unit is Ampere, A, Electricity is about Resistance - SI unit is Ohm, Electricity is about Voltage - SI unit is volt, V, The rate of flow of charges dQ (C) I (A) = -------- dt (s) in semiconductors - Negative free electrons and positive holes can flow - Current is the sum of electron-current and hole-current - I = I (-e) + I (+h), The rate of flow of charges dQ (C) I (A) = -------- dt (s) in metals - Only free electrons can flow - Current is the result of electrons flow per second - I = I (-e), Current - SI unit is Ampere, A is about The rate of flow of charges dQ (C) I (A) = -------- dt (s)