PHYSICS C10 Lecture Notes - Lecture 12: Michael Faraday, Ferromagnetism, Maglev
Document Summary
Electricity & magnetism: general rules governing electricity and magnetism, steady i b (a steady current creates a magnetic field, i-wire in a b field feels a force (a current-carrying wire in a magnetic field feels a force) This is how motors work: changing b i (a changing magnetic field creates a current. Fields: magnetic fields are always loops in some form or another, electric fields can be made in two ways. Isolated charges (field converges on a single point) Induction (electric fields created by induction are in loops) Ac current: tesla realized ac was the only effective way to transport electricity across long distances because it can be given enormous voltage and thus low current. Need as small a current as possible to prevent heat loss from resistance as electricity flows through wires. Poles that support electric wires have can-shaped devices on them.
