6.5 Electricity - Resistivity and Superconductivity Flashcards
1
Q
Definition of resistivity:
A
resistance x cross-sectional area / length
2
Q
Unit of resistivity:
A
ohm metres
3
Q
Symbol for resistivity:
A
rho (p)
4
Q
Superconductivity definition:
A
A property of certain materials which have 0 resistivity at/and below a critical temperature
5
Q
Uses of superconductivity:
A
Maglev trains
MRI scan
Particle accelerations
Power transmissions
6
Q
Resistivity changing with temperature:
A
The resistivity of a material can be lowered by lowering its temperature
If a material is cooled below a temperature called the critical temperature, its resistivity disappears entirely. It is now a superconductor
7
Q
Critical temperature definition:
A
The temperature at which a material becomes superconducting
