Note: "Turn on (electrical appliances, switches) and turn on (power supply)" can be turned on or off. Another example is: Sheturned/? Turn on the kettle. She turned on the electric kettle.
Turnon and switchon are both verb phrases composed of "verb+adverb". When using them, we should pay attention to the position of the object: the noun object can be placed in the middle of the phrase or behind the phrase; But when personal pronouns are used as objects, they can only be placed in the middle of phrases.
example sentence
1 She turned off the light.
She turned on the electric kettle.
2、AfterfixinguptheTV，heturned/switchediton。 ?
After the TV was repaired, he turned it on. It can only be placed before the adverb on in this sentence.