Definations 2 Ym And Electricty Flashcards
Define plastic deformation
Deforming force beyond elastic limit. Intermolecular structure
Changes as the crystal planes slide past each other causing the material to be permanently deformed
Elastic limit
Max load a material can take and still return to its original length
Limit of proportionality
When f and X are proportional
Yield point
Intermolecular structure permanently changed
Plastic region
Wire beyond elastic limit stretches until it breaks
Stress
Applied force per unit area
F/a. Measured in Nm^-2 or Pa
Strain
Ratio of change in length to the original
Delta L / lo
Young’s modulus
Ratio of stress to strain. With in limit of proportionality
E= Flo/ delta L a
Ultimate tensile stress
Max stress without fracture
Define hookes law and give an equation
F=kx wher X is the extension, k is the spring constant and f is the load.
Up to the limit of proportionality (max load) the extension of an elastic material is proportional to the applied load.
Define electric current
rate at which charged particles pass a point in a circuit ?- double check this one
Express charge in terms of current
Q=It
Define potential difference
electrical energy converted per columb of charge passing between two points
Give an equation relating voltage and energy
V=W/Q where V is P.D, W is energy and Q is charge
Define electrical power
Rate at which electrical energy is converted into other forms of energy by circuit or component
