electricity Flashcards
charge
unit : C
defintion: amount of current carried charge/ s
mass proton
1.62E-27 kg
mass electron
9.019E-31 kg
proton charge
1.6E-19
electron charge
-1.6E-19
conductors
charge easily moves through
insulators
materials that do not allow charge to pass through
high resistance means
low conductivity
resistance eqn
R= ρ(L/A)
- L is length of conductor
- a is area
- ρ resistance constant for material
conductivity eqn
G=c(A/L)
c = material specific constant
coloumbs law
F = kQ1Q2/ (r^2)
force between two charged objects
k - constant 8.99E9
coloumbs constant eqn
1/(4piEo)
Eo
permitivity of free space
8.85E-12
what does columbs law resemble
gravitational force
what is electrical force proportional to
mass and charge of the particles
inverse of the dsitance squared
electric field
E= F/q
E is electric field
F is force experienced by test charge
q is magnitude of test charge
electric field equation in terms of coloyumbs law
E= kQ/r^2
where q is the magnitude of the charge originally in the electric field
what happens to electric field as distnace increases
electric field decreases
force experienced by a charge in an electriv field
F = E*q
field lines
indicate the direction and magnitude of electric fields, the arrows in field lines point in the direction that a posirive test charge would travel in the electric field
- away from positive and toward negative
capacitors
sources of charge are arannged linearly and parallel to one another
dipoles
substance with 2 different stable charges at each end
dipole in a uniform field
aligns with the electric field lines
torque
