Electrostatics/Electrodynamics

Static Electricity

Charges

Positive

Negative

Electrification

Friction

Contact

Induction

Laws

Charges

Like Charges Repel

Unlike Charges Attract

Force Between Charges

Coulomb's Law

F = k([Q1 x Q2]/Dsq)

Directly Proportional To Product Of Their Quantities

Inversely Proportional To Square Of Distance Between Them

F = Force In Newtons

k is medium dependent constant

Q is quantity in Coulombs

D is distance in meters

Charges Reside Only On External Surfaces Of Conductors

Charges Concentrate On Point Of Greatest Surface Curvature

Only Negative Charges (Electrons) Can Move In Solid Conductors

Electric Charges In Motion

Electric Circuit

Potential Difference

Drives the Electrons

EMF (Electromotive Force) = Maximum Difference Of Potential

1 Volt = 1 Joule/Coulomb

Current

Amount Of Charge Flowing Per Second

Ampere (Amp) = 1 Coulomb Charge Flowing Per Second

Resistance

Property Of Circuit Which Hinders/Opposes Current Flow

Ohm = Resitance Of Column Of Mercury: 14.45g wt./106.3 cm ht.

Ohm's Law - I = V/R

I = Current In Amperes

V = Potential Difference In Volts

R = Resistance In Ohms

Conductance

Reciprocal Of Resistance

Material

Length

Cross-sectional Area

Temperature