Recistance of a wire: required practical Flashcards
1
Q
IV
A
Length of wire
2
Q
DV
A
resistance of the wire
3
Q
CV
A
temp. of the wire, cross section of the wire(diameter) of the wire
4
Q
Equipment needed
A
Battery Ammeter Voltmeter length of wire meter ruler Tape crocodile clips switch
5
Q
What is the method
A
Attach wire on meter ruler by putting tape on both sided
Attach crocodile clips that are connected to the circuit depending on what length you want an it can change
6
Q
The resistance of the wire is… to the length
A
directly proprtional
7
Q
Zero error
A
Is a reading on measuring instrument when the value should be 0
8
Q
What to do prevent as much error as you can
A
Increase p.d : This will keep the current low =, reducing any heating in the wire
Only turn on the current when taking a reading. Turn off the current between reading
9
Q
How does a vertical reaisitor work
A
You can change the lenght of wire affecting recistance
