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Conductors
Charging
Charging an object consists in creating an imbalance on the electrical charge of that object.
What are some examples?
Electrolytic Solutions pg 142
Conductors
Substance that allows free flow of electrical charges to pass
Ex. Metal wires (ex. copper) Graphite rods
Semi-conductors
Substance that has an electrical conductivity between that of a conductor and insulator.
This allows it to control the amount and direction of the flow.
Insulators
Substance that does NOT allow free flow of electrical charges to pass
Ex. Plastic, Wood, Paper,
Rubber, Glass, Ceramics
Water is NOT a good conductor
Nichrome is a POOR conductor used in resistors,
toasters, radiators…
Conductance (G): Is a number that tells you how well
electrical current flows
Characteristic property
Measured in Seimens “S”
Conductors have HIGH
conductance
Insulator have LOW conductance
Conductance of a wire depends on:
LengthDiameterTempMaterial
Copper is the BESTMetals better than non-metals
Which is a better conductor?
WoodPlastic
Iron
Copper
Which metal wire has the best conductance?
SHORTFAT
COLD
Which wire is the best conductor?
Copper25o C
Copper25o C
Copper5o C
SHORTFAT
COLD
Copper55o C
Wood55o C
Aluminum25o C
Copper is the best conductor
Wires that are: SHORT FAT COLD
Nichrome is the best resistor
have a high conductance
Page 479, Q. 8-10.Worksheet #8
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