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"were switched on" is correct and usable in written English.
You can use it when you are referring to a machine or electrical device being turned on, activated, or energized. For example: "The lights in the room were switched on, filling the space with a warm yellow glow."
Exact(60)
The traps were deployed at 16 of the 20 foraging sites described above and were switched on for one hour prior to sunset.
On the Embankment, where Games lanes were switched on, traffic was moving by late morning.
But once the monitors were switched on, their internal temperatures rose to between 122 and 131 degrees Fahrenheit, and significant levels of triphenyl phosphate were released.
Although no light bulbs were switched on anywhere in the house, as far as I could see, it was bright enough for me to take notes.
"We found activation in an area called insular cortex in four of the six machines when they were switched on," he added.
At other polling places, the scanners failed to operate properly when they were switched on, forcing voters to wait while election workers struggled to get the devices going.
They found only 23 genes that were switched on by two common kinds of adjuvants.
Nearly all of the Rosetta mission's instruments were switched on for a period of several hours around closest approach (1544 GMT; 1644 BST; 1744 CEST on Saturday).
The covers came off on a couple of occasions and the floodlights were switched on in an attempt to get play.
The floodlights were switched on by club president Lady Blanche Cobbold for the first floodlit match at the ground, a friendly against Arsenal, in February 1960.
The purple hole lights were switched on after hand-poking following the usual schedule.
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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