I guess you'd like to know which verb is proper to use to switch on/off some devices. It depends on what kind of device you are to use it for, but we often use つける／消す for on/off. Here are some examples: ライト（orあかりor電気）、テレビ、ガス、火を　つける／消す 換気扇(extractor fan)、洗濯機(washer)を　回す／止める スイッチを　押す／切る 電源(power source)を　入れる／切る I hope this will give you more ideas!

As you know, one word has many meanings. so you should look it up meanings that I didn't write here. つける　means turn on sth. ex) Turn on the TV. テレビをつける。 消す、切る They have same meaning which is turn off sth. ex) Turn off the TV. テレビを消す/切る。