Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
What are the three things that determine resistance |
Length Area Resistivity |
|
Length |
The longer the wire and the more difficult it is to make a current flow |
|
Area |
The wider the wire the easier it will be for the electrons to pass along it |
|
Resistivity |
(Depends in the material) The structure may make it easy/difficult for change to flow |
|
What environmental factors does resistivity depend on |
Temperature and light intensity |
|
Resistivity equation |
(Resistance x Area) / length |
|
What is resistivity measured in |
Ohm metres |
|
Method for resistivity of the wire |
Look at page 86 in revision guide |
|
What is resistivity caused by |
Interaction of moving electrons (current) with fixed positive ions of the metal |
|
What is resistivity caused by |
Interaction of moving electrons (current) with fixed positive ions of the metal |
|
Resistivity as temperatures increases |
As temp increases, electrons lose more energy in these interactions, less collisions and the resistance increases Change in resistivity is proportional to change in temp in particular metals |