| A | B |
|---|
| Faraday's law | Law of electromagnetic induction |
| Iron core in transformer | Link the magnetic lines between the coils |
| Step up transformer | Output voltage is higher |
| Step down transformer | Less turns of coil in the secondary coil |
| Type of voltage for transformer | Alternating voltage |
| Ideal transformer | 100% efficiency |
| High voltage,small current | power transmission |
| Laminated core | prevent eddy current |
| thicker wire in the coils | less resistance, less energy loss |
| Bicycle dynamo | Rotating magnet between wire coils |
| Fleming's right hand rule | find the direction of induced current in a wire cutting magnetic lines |
| Fleming's left hand rule | find the direction of the magnetic force on a conductor in a magnetic field |
| Magnetic lines of force | Paths of a free magnetic N-pole in a magnetic field |
| Soft iron | easy to magnetize and demagnetize |
| Commutators in d.c. motor | half rings |
| Lenz's law | the induced current creates a magnetic force to oppose the change |
