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Discover LudwigThe phrase "switched on" is a correct and usable phrase in written English.
You can use it to refer to someone or something that is mentally alert, involved, or engaged. For example, "The students were switched on during the lesson and eager to participate in the discussion."
Dictionary
switched on
verb
Past of switch on
Exact(60)
"The light switched on," she said.
A lightbulb switched on in his head.
And which lamps are switched on?
Filters should not be switched on automatically.
After system deployment, the switch should be switched on manually.
But something switched on in Cornet and it all changed.
So I switched on NPR.
Then the whole thing switched on me.
In December, it was switched on for the first time.
But somehow it was switched on in Monsanto's variety.
That switched on a light bulb for me.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com