Symbol

Quantity

Description

Formula

Units

F_E

Electric Force

the force between 2 charged particles

F_E = kq₁q₂/r²   (Coulomb's Law)

N

E

Electric Field

F_E per positive unit charge

E = kq₁/r²  = F_E/q₂

N/C or V/m

φ_E

Electric Flux

# of field lines that pass through a surface

φ_E = Q/ε_o     (Gauss's Law)

Nm²/C

V

Electric Potential

Work done to bring a unit positive test charge from infinity to a point

V = kq/r = Er

V = IR   (Ohm's Law)

V

V

Potential Difference

Work done to bring a 1C charge from one point to another

V = W/q = Es

V

C

Capacitance

C = q/V = κε₀A/d

F

R

Resistance

R = V/I

Ω

ρ

Resistivity

a number that tells how much resistance different materials have

ρ = RA/L

Ωm

I

Current

Flow of electrons

I = V/R

A

P

Power

P = IV = I²R = V²/R

W