Flashcards
CHARGE AND CURRENT
Cards in this deck (17)
- 1ChargeCurrent that flows across a certain point over a given time period.
Q=It - 2CurrentA measure of electron flow
through a circuit. - 3VoltageThe energy difference between
two points in a circuit. - 4Amps / CoulombsAmps - electron flow through a circuit
Coulombs - Amps over a given time - 5Mean Drift VelocityThe average velocity of the flow of electrons through a circuit.
- 6Conventional Current vs Electron FlowConventional current is from
positive to negative.
Electron flow is from
negative to positive. - 7JunctionThe point in a circuit where current
splits into two or more paths. - 8Kirchoff's First LawThe addition of current going in to a junction is equal to the addition of the current going out of a junction.
- 9Number DensityThe amount of electrons in a cubic
metre of a given substance. - 10What is the Elementary Number?±1.6 x 10^-19
The amount of charge in
one electron or proton. - 11InsulatorA material with a very low
number density. - 12Semi-ConductorA material with a number density
of about 10^17m^-3 - 13ConductorA material with a number density
of about 10^28m^-3 - 14SuperconductorA material where resistance is zero
when below a certain temperature,
which is called the critical temperature. - 15What are the uses of a superconductor?Can be used to make very
strong magnets.
Can reduce energy loss
in electricity transferring
over long distances. - 16What is the equation for charge?Q=It
- 17What is the equation for mean drift velocity?I=Anev
I = current (Amps)
A = cross-sectional area of material (m^2)
n = number density (m^-3)
e = elementary number (C)
v = mean drift velocity (ms^-1)
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- A level Physics Flashcards on CHARGE AND CURRENT, created by James Sweeney on 03/10/2023.
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- James Sweeney
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