Materials Flashcards
(16 cards)
Brittleness
When subjected to stress it breaks without significant strain
Density
The amount of matter per unit volume
Ductility
Ability of a material to undergo large plastic deformations before failure
elastic deformation
a material strain where a solid body temporarily changes shape when stress is applied
hardness
The resistance the solid matter is to various kinds of permanent deformations when compressive force is applied
malleability
ability of a material to undergo permanent deformation without fracture when under stress
stiffness
ability of a material to resist bending, twisting and stretching (deformation)
strength
How a material behaves when loaded
What determines the properties of a polymer
Chain length, cross links, use plasticisers and crystallinity
When does resistance increase
An increase in the length of the wire or increase in the thickness
Current and voltage in series circuits
Current is the same and the voltage splits up
current and voltage in a parallel
current splits up and voltage stays the same
Resistance in series
R1 +R2 + R3
resistance in parallel
1/R + 1/R + 1/R
What is drift velocity
the average speed particle travel along a conductor
how can current be measured using drift velocity
I= vAnq
