Physics 4 - Electricity Flashcards
equation for power?
P=iVrate of energy transfer
units for charge?
charge=q=coulombs
coulomb’s law states?
force between 2 point charges inversely proportional to the square of the distance between them and proportional to the magnitude of each chargeF=k(q1q2)/r2
what is the charge on an electron, in C?
1.6e-19 Coulombs
electric field always points to?
negative charge
force on a point charge in a field equation?
F=qE
electric potential of charge in E field?
PE=qEd
what is voltage, and its equation?
Voltage is POTENTIAL for work in electric field.V=EdUnits:J/C
equation for work done in electric field?
W=qEd
what is current, its units, and direction of flow?
current is a moving chargeunits: amps or C/sflows OPPOSITE flow of electrions
equation for Ohm’s law?
I=V/R or V=IR
equation for capacitance?
C=Q/V, Q=CVC= capacitanceQ=charge on each plateV= voltage
PE stored in capacitor equation?
PE=1/2QV
dielectric constant is?
how much a material can permeate an electric flux
resistor in series?
Reff=R1+R2+R3
Resistors in parallel?
1/Reff=1/R1+1/R2+1/R3
Capacitors in Series?
1/Ceff=1/C1+1/C2+1/C3
Capacitors in parallel?
Ceff=C1+C2+C3
Lorentz force?
Force on an electric charge in magnetic fieldF=qvBsintheta
does the distance between 2 parallel plate capacitors affect the potential between them?
no
what is the sign for the potential in a galvanic cell?
negative
what is resistivity?
resistivity=resistance*area/ length
how does a magnetic field influence a moving charge?
acts perpendicular to direction of field (B) and velocity of particle)
what is the magnitude of force between two charges of equal charge but different mass?
EQUAL
what is the work done on a charged particle in an electric field?
qv
a neutral molecule with a dipole moment will experience what in an electric field?
net torque
should you consider stoichiometric coefficients when calculating overall reduction potentials?
NO
what are the equations for power dissipated by a circuit?
P=VI, P=V2/Req, P=I2Req
