# Electric Current

Flashcards by LotzaLemmon, updated more than 1 year ago
 Created by LotzaLemmon about 7 years ago
51
5

### Description

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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