Electronics/Expanded Edition Fundamentals

Expanded Edition

Coulomb's law edit

Dielectric constant, definition of charge

Electricity

 

The force resulting from two nearby charges is equal to k times charge one times charge two divided by the square of the distance between the charges.

 

The electric field created by a charge is equal to the force generated divided by the charge.

 

Electric field is equal to a constant, “k”, times the charge divided by the square of the distance between the charge and the point in question.

 

Electric potential energy is equal to a constant, “k” multiplied by the two charges and divided by the distance between the charges.

Variables

F: Force (N) k: a constant, 99 (N•m2/C2) q1: charge one (C) q2: charge two (C) r: distance between the two charges, (m)

A charge in an electrical field feels a force. The charge is not a vector, but force is a vector, and so is the electric field. If a charge is positive, then force and the electric field point in the same direction. If the charge is negative, then the electric field and force vectors point in opposite directions.

A point charge in space causes an electric field. The field is stronger closer to the point and weaker farther away.

Ampere's law edit

Definition of current, magnetic permittivity

Lorentz force edit