From Longman Dictionary of Contemporary Englishswitch on phrasal verbSWITCH ON OR OFFto turn on a machine, light, radio etc using a switchswitch something ↔ on He switched the torch on. The lights switch on automatically when it gets dark. → switch→ See Verb table
Examples from the Corpus
switch on• Do you mind if I switch the light on?• Exhaust fumes come into the car when I switch on the air conditioner.• I switched on the radio to listen to the news.• Will you switch on the television? 