1. Resistivity I understand this I need to look over this
I need help with this
Resistivity

2. I understand this
I need to look over this
I need help with this
RESISTIVITY
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions

3. RESISTIVITY Resistance: Resistivity:
I understand this
I need to look over this
I need help with this
RESISTIVITY
Resistance:
Resistivity:
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions

4. I understand this
I need to look over this
I need help with this
RESISTIVITY
Resistance is the property of the object (e.g. copper wire), whereas resistivity is the property of the
So for example take two objects A and B made of copper. Both are of a different size.
The resistance of A & B will be
But the resistivity will be the
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions

5. I understand this
I need to look over this
I need help with this
RESISTIVITY
The resistance of a material is proportional to its length, i.e. the longer it is the higher R;
The resistance of a material is inversely proportional to its cross sectional area, i.e. the thicker the wire the lower R.
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions

6. I understand this
I need to look over this
I need help with this
RESISTIVITY
R ∝ L/A
To turn this proportionality into an equation we need to add a constant of proportionality (k).
E.g. the time a car is driven for is proportional to the distance it will travel. The constant of proportionality is the speed it is travelling.
The amount of money I earn is proportional to the time I work. The constant of proportionality is the hourly wage.
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions

7. I understand this
I need to look over this
I need help with this
RESISTIVITY
R ∝ L/A
To turn this proportionality into an equation we need to add a constant of proportionality (k).
What are the units of ρ?
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions

8. I understand this
I need to look over this
I need help with this
RESISTIVITY
The resistivity of a material and the conductivity of a material are inversely linked.
Good conductors have a low , while poor conductors (insulators) have resistivities that can be
larger.
A low resistivity indicates a material that
To be able to distinguish between resistance and resistivity
Select and use appropriate equations
Apply to more complex questions