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Electric Current

LotzaLemmon Physics AS level Inglés 14 fichas

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1Define Current.The net flow of charged particles.
2Why does current flow through a metal?Due to the movement of electrons.
3Why does a current flow through an electrolyte?Due to the movement of ions.
4Define Conventional Current.A model used to show the movement of electrons in a circuit, from positive to negative.
5Define Electron Flow.The movement of electrons around a circuit from negative to positive.
6Define Electric Charge.One columb is equal to the flow of one ampare in one second.
1c = 1A x 1s.
7What is an ammeter?An instrument used to measure electrical current in a circuit.
8What is Elementry Charge?The charge of an electron.
1.6x10^-19 C
9What is Kirchoff's first law?The sum of the currents entering a junction is equal to the sum of currents exiting the junction.
This is the conservation of Charge.
10Define Mean Drift Velocity.Average speed of charged particles along a length of a conductor.
11Define a conductor.A material with a high number of conduction electrons and a low resistance.
12Define a semiconductor.A material that has a low number of conduction electrons and a high resistance.
13Define an insulator.A material with a number density nearing 0 and a very high resistance.
14Define Potential Difference.Energy transferred per unit charge of electrical energy into another form of energy.
1V = 1I x 1R