Physics 4 - Electricity

Question 1

equation for power?

Answer 1

P=iVrate of energy transfer

Question 2

units for charge?

Answer 2

charge=q=coulombs

Question 3

coulomb’s law states?

Answer 3

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

Question 4

what is the charge on an electron, in C?

Answer 4

1.6e-19 Coulombs

Question 5

electric field always points to?

Answer 5

negative charge

Question 6

force on a point charge in a field equation?

Answer 6

F=qE

Question 7

electric potential of charge in E field?

Answer 7

PE=qEd

Question 8

what is voltage, and its equation?

Answer 8

Voltage is POTENTIAL for work in electric field.V=EdUnits:J/C

Question 9

equation for work done in electric field?

Answer 9

W=qEd

Question 10

what is current, its units, and direction of flow?

Answer 10

current is a moving chargeunits: amps or C/sflows OPPOSITE flow of electrions

Question 11

equation for Ohm’s law?

Answer 11

I=V/R or V=IR

Question 12

equation for capacitance?

Answer 12

C=Q/V, Q=CVC= capacitanceQ=charge on each plateV= voltage

Question 13

PE stored in capacitor equation?

Answer 13

PE=1/2QV

Question 14

dielectric constant is?

Answer 14

how much a material can permeate an electric flux

Question 15

resistor in series?

Answer 15

Reff=R1+R2+R3

Question 16

Resistors in parallel?

Answer 16

1/Reff=1/R1+1/R2+1/R3

Question 17

Capacitors in Series?

Answer 17

1/Ceff=1/C1+1/C2+1/C3

Question 18

Capacitors in parallel?

Answer 18

Ceff=C1+C2+C3

Question 19

Lorentz force?

Answer 19

Force on an electric charge in magnetic fieldF=qvBsintheta

Question 20

does the distance between 2 parallel plate capacitors affect the potential between them?

Answer 20

no

Question 21

what is the sign for the potential in a galvanic cell?

Answer 21

negative

Question 22

what is resistivity?

Answer 22

resistivity=resistance*area/ length

Question 23

how does a magnetic field influence a moving charge?

Answer 23

acts perpendicular to direction of field (B) and velocity of particle)

Question 24

what is the magnitude of force between two charges of equal charge but different mass?

Answer 24

EQUAL

Question 25

what is the work done on a charged particle in an electric field?

Answer 25

qv

Question 26

a neutral molecule with a dipole moment will experience what in an electric field?

Answer 26

net torque

Question 27

should you consider stoichiometric coefficients when calculating overall reduction potentials?

Answer 27

NO

Question 28

what are the equations for power dissipated by a circuit?

Answer 28

P=VI, P=V2/Req, P=I2Req