Self-induction principle
Fall in potential principle
Ferro-resonant principle
Mutual induction principle
Step up transformer
Step down transformer
Torodial autotransformer
Constant voltage transformer
Ammeter
Voltmeter
Ohmmeter
Multimeter
Oscillator and rectifier stages
llator and amplifier stages
Amplifier and transformer output stages
Oscillator, amplifier and transformer output stages
Computers
TV receiver
DVD players
General lighting
