ELECTRIC CURRENT

morgancaldecoat
Mind Map by morgancaldecoat, updated more than 1 year ago
morgancaldecoat
Created by morgancaldecoat almost 5 years ago
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MIMND MAPO FIOR ELECTRIC CURRENT OCR
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ELECTRIC CURRENT
1 KIRCHOFF'S FIRST LAW
1.1 THE SUM OF THE CURRENTS ENTERING A JUNCTION IS ALWAYS EQUAL TO THE SUM OF THE CURRENTS LEAVING THE JUNCTION
1.1.1 THIS IS AN EXAMPLE OF CONSERVATION OF CHARGE
2 AMMETERS
2.1 MEASURE CURRENT IN A CIRCUIT
2.1.1 CURRENT MEASURED IN AMPS (A)
2.2 HAVE EXTREMELY LOW RESISTANCE
2.3 MUST BE PLACED IN SERIES
3 CHARGE
3.1 Q=It
3.2 MEASURED IN COULOMBS
3.2.1 1C IS THE TOTAL CHARGE SUPPLIED BY A CURRENT OF 1A IN 1s
3.3 CHARGE ON AN ELECTRON = 1.6 X 10^-19
4 CONVENTIONAL CURRENT FLOWS FROM + TO -
5 ELECTRON FLOW FROM - TO +
6 CONDUCTORS
6.1 HIGH ELECTRON DENSITY
6.2 SEMICONDUCTORS
6.2.1 LOW ELECTRON DENSITY
6.3 SOLID
6.3.1 DELOCALISED ELECTRONS FROM METAL ARE THE CHARGE CARRIERS
6.4 LIQUID
6.4.1 POSITIVE IONS FROM ELEMENTS (eg CHLORIDE IONS) ARE THE CHARGE CARRIERS
7 DRIFT VELOCITY
7.1 I = nAve
7.1.1 I IS CURRENT
7.1.2 n IS THE NUMBER OF CARRIERS
7.1.3 A IS THE CROSS SECTIONAL AREA
7.1.4 v IS THE VELOCITY
7.1.5 e IS THE CHARGE ON THE CARRIER
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