5.1 Electrical Fields Flashcards
What is charge and what is it measured in?
A partical can be positevly, negativly or neutraly charged.
These states cause forces when placed in a magnetic field.
This attratction between charges is measured in coulomb.
Explain the law of conservation of charge.
Energy can neither be created nor destroyed.
or
in a closed system no charge gets lost.
What refers “fundamental charge” to.
Fundamental charge is the negative charge of one electron.
1.6*10^-19
Electric field lines show the direction of the net force acting on a …..
The arrow in field lines points towards…
postive point charge.
The arrow in field lines points towards the negative charge.
Define Electronvolt
Electron volt is the charge of one electron carried in one amp with a poptential diffrence of one volt.
Which formula is required to calculate the final speed of an electron accelerated across a potential difference?
Kinetic Energy Formula
from mass and velocity the kinetic energy can be calculated
State Coulomb’s Law.
What is k in Coulomb’s law?
Coulom’s Law:
Like charges repel and opposite charges attract, with a force proportional to the product of the charges and inversely proportional to the square of the distance between them.
k = Coulombs constant
What is permittivity?
In which formula permittivity is used to calculate the force experienced by a charge?
Permittivity is the ability of a substance to store energy in an electric field.
The permittivity ε is part of Coulombs constant, whic is required to calculate the Force between two charges of a certain distance in a medium with a certain permittivity
In which directions do electrons flow and in which direction does conventional current flow?
electron flow:
Goes from negative to positive
Conventianal current:
Positive to negative.
How is electric field strength measured?
electric field strenght is the force per unit charge experienced by a small positive point charge at that point.
Explain the potential difference using units of energy and charge.
The potential difference between two points is one volt if …..
The potential difference between two points is one volt if .. one joule of energy is transferred per coulomb of charge passing between the two points.
What is the charge densisty of a conductor.
Number of charge carriers (usually electrons) in a conductor
Explain the variables in the drift velocity equation:
I = nAvq
I = Current
n = Number of electrons
A = Area
v = Length
q = Coulomb (charge)
Which formula is required to calculate the electical current, if you have the charge that passes whithin a specified time ?
Electric current is defined as the rate at which charge flows past a point on the circuit.
I = Q / t
where Q is the quantity of charge flowing by a point in a time period of t.
