Electric Current

Flashcards by LotzaLemmon, updated more than 1 year ago
Created by LotzaLemmon about 7 years ago


The definitions of key points in OCR A physics G482.

Resource summary

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