Conduction of Electricity Flashcards
UNIT FOR CHARGE
COULOMB (C)
CHARGE ON AN ELECTRON
-1.6*10^-19 C
DEFINITION FOR ELECTRIC CURRENT
RATE OF FLOW OF ELECTRIC CHARGE
SYMBOL FOR ELECTRIC CURRENT
I
UNIT FOR ELECRTIC CURRENT
(Amps) A
DIRECTION OF ELECTRIC CURRENT
POSITIVE TO NEGATIVE
DIRECTION OF ELECTRONS FLOW
NEGATIVE TO POSITIVE
DESCRIBE THE BONDING IN METALS
METAL LATTICE WITH FREE ELECTRONS
WHAT EFFECT DOES INCREASING AND RESISTANCE HAVE ON DRIFT VELOCITY
DRIFT VELOCITY DECREASES
EQUATION LINKING CURRENT TO DRIFT VELOCITY
I=nAve
WHAT EFFECT DOES DOUBLING THE DRIFT VELOCITY HAVE ON THE CURRENT
CURRENT ALSO DOUBLES
WHAT CAN BE SAID FOR THE VALUE ‘n’ & ‘e’ FOR A SPECIFIC MATERIAL
THEY ARE CONSTANT AND DO NOT CHANGE FOR A SPECIFIC MATERIAL
IF THE RADIUS OF THE WIRE DOUBLES WHAT EFFECT DOES THIS HAVE ON THE CURRENT
V DECREASES BY THE FACTOR OF 4
EFFICIENCY EQUATION
(USEFUL OUTPUT/TOTAL INPUT) *100
ONE AMPS IS SAME AS?
1 CS^-1
HOW TO FIND THE RATE OF CHARGE TRANSFER FROM A CURRENT TIME GRAPH
AREA UNDER THE GRAPH
WHAT HAPPENS WHEN THERE IS NO PD ACROSS THE METAL
THE DIRECTION OF THE MOTION OF THE ELECTRON IS RANDOM, ZERO NET VELOCITY, FREE ELECTRONS MOVE FAST AROUND 10^6 MS^-1
WHAT HAPPENS WHEN THERE IS PD ACROSS THE METAL
THE DIRECTION OF THE MOTION OF THE ELECTRON IS TOWARDS THE POSITIVE SIDE, IS ACCELERATED , DRIFT VELOCITY IS SMALL AROUNF 10^-3 OT 10^-4 MS^-1
