Electrostatics Flashcards
How much is an electric charge?
What is the SI unit?
1.6 * 10 to the power of -19.
Coulomb.
They need charge carriers: electrons.
What is an electric interaction?
What formula can be used?
What is the base unit for this formula?
The force/interaction the electric charges exert on each other.
Coulombs Law:
F = k * q1 * q2 divided by r2
Newton
What is an electric field?
What formula can be used to calculate this?
The forces the charges exert on each other is directed at this field instead of directly on each other.
Force acting on the positive test charge/ charge.
Electric field strength (E)
E: F/q. N/C
What is an homogenous electric field?
The force acting on the positive test charge has the same strength and the same direction at each point.
What is the formula to calculate coulomb force?
F = k * q1 * q2/r2 Newton
Two bodies ‘A’ and ‘B’ have the same charge (qa = qb) so they act with a certain force on one another. We double qb’s force. What is correct?
The both forces acting on each other will double.
Voltage: formula and SI unit
U = work/charge Volt or
U= E * d. In capacitor
U = q/C Of capacitance
U= R/ I
Electric field strength: formula and SI unit
E = F/q N/c. or. E= U/d V/m
What is the formula for capacitance and what is the SI unit?
C= q/U. Farad
C= Eo * Er * A/d In capacitor.
What is the formula for energy stored in a capacitor?
W = 1/2 CU2. Joule
What is the formula for resistance in a conductor/ resistivity and what is the SI unit?
R = p (of material) * length/Area. Ohm * m.
Electric conductance? Formula and SI unit
G = 1/R Siemens
Specific conductance? Formula and SI unit
Sigma = 1/p (resistivity) S/m
What is the formula for Joule heating?
W = U * I (electric current) * t or W = U2/R * t
Electric power?
P el = U * I (electric current)
P el = U2/R
