Mechanical energy can turn metal coil in magnetic field to generate electric current {generator, electricity} {electric generator}.
current
Electric current is in coil leading and trailing edges. Current changes direction with coil half turns, to make alternating current.
voltage
Voltage V equals magnetic field H times wire movement velocity v times wire-coil length l: V = H*v*l. Voltage V equals magnetic field H times area change dA divided by time change dt: V = H * dA / dt. Voltage V equals flux change dF divided by time change dt. V = dF / dt. Voltage V equals mutual inductance I times current change di divided by time change dt. V = I * di / dt.
example
Water from dams or steam from steam engines can turn wire coils around steel shafts {rotor, generator}, which are inside permanent magnets. Magnets and rotation cause electric current to flow in coils. Electric current changes direction as coil flips.
AC or DC
Rotor shaft {commutator, generator} can have separate conductors {brush, generator} on halves to allow current to leave rotor as direct current. Large-generator shafts {armature} collect alternating current directly.
Physical Sciences>Physics>Electromagnetism>Magnetism>Machine
5-Physics-Electromagnetism-Magnetism-Machine
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224