The document discusses conductors, semiconductors, and insulators. It defines conductors as substances that allow free flow of electrical charges, like metal wires and graphite rods. Semiconductors have conductivity between conductors and insulators, allowing some control of charge flow. Insulators do not allow charge flow and include materials like plastic, wood, and glass. The document discusses factors that affect conductance, including length, diameter, temperature, and material of a wire. Copper is identified as the best conducting material.

1. Conductors

2. Charging
Charging an object consists in
creating an imbalance on the
electrical charge of that object.
What are some examples?
Electrolytic Solutions pg 142

3. Conductors
Substance that allows free flow of
electrical charges to pass

Ex.


Metal wires (ex. copper)
Graphite rods

4. 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.

5. Insulators

Substance that does NOT allow free
flow of electrical charges to pass

Ex.
 Plastic, Wood, Paper,
Rubber, Glass, Ceramics

6. Water is NOT a good
conductor
Nichrome is a POOR
conductor
used in resistors,
toasters, radiators…

7. 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

8.  Conductance
of a wire depends
on:
Length
Diameter
Temp
Material
 Copper
is the BEST
 Metals better than non-metals

9. Which is a better conductor?
Plastic
Wood
Copper
Iron
SHORT
FAT
COLD
Which metal wire has the best
conductance?

10. Which wire is the best conductor?
Wood
55 C
o
SHORT
FAT
COLD
Copper
25 C
o
Copper
25 C
o
Copper
55 C
o
Aluminum
25 C
o
Copper
5C
o

11. 
Copper is the best conductor

Wires that are:




SHORT
FAT
COLD
have a high
conductance
Nichrome is the best resistor

12. Activities:
Page
479, Q. 8-10.
Worksheet #8

13. Alternative Educational Experiences
through e-Learning