what does " turn on mean"?

Phrasal verb " Turn on"
idioms and phrases idioms in english idioms and phrases for competitive exams idioms and phrases with phrases idioms by Rani idioms for IELTS idioms and phrases in english idiomatic expressions idioms and Urdu idioms idiom by dear sir phrasal verbs phrases in english phrases and phrasal verbs in english
"Turn on the lights": Activating or switching on the lighting.
"Turn on the TV": Starting or powering up the television.
"Turn on the computer": Switching on the computer to make it operational.