How things work college course/Electricity and Field theory
For an introduction to the purpose and scope of this work see Talk:How_things_work_college_course/Electricity_and_Field_theory
- Electricity is the motion of charged particles (usually electrons)
- Electrons have potential energy due to electric forces. Potential energy is associated with these forces, and the fact that energy is involved that makes electricity useful.
- To understand energy we we need to introduce the concept of fields.
- Wind velocity and air temperature are defined on Earth's atmosphere.
- Three other important fields are electric potential, electric field, and magnetic field. The first two can be defined by analogy with gravity.
- There are two ways to visually represent vector fields: A spatial distribution of vectors, and field lines.
- The most common way to represent a scalar field is the use of contours.
- The gravitationa analogy (first of two analogies)
- F = mg like F=qE
- PE = Fd if force is uniform and parallel to displacement
- PEG = m(gh) = mφ, where φ=gh is gravitational potential.
- PE = qEd = q(Ed), where V=Ed is gravitational potential (replace h=height by d=distance)
- Inverse square
- (advanced sum over sources)
- Electric fields are rarely uniform. Need examples
Conformal power two.svg
Conformal power two third.svg
Conformal power half.svg