Or "she plugs the fridge in". As in, "did you plug it in?"
Duolingo needs major English lessons so it doesn't waste our time
"Outlet" means something very different in British English, relating to water supply, sewage effluent etc. In general, a plug goes into an (electrical) "socket".
How do you know when liga is turning something on it plugging it in?
Could you also turn the fridge on at the outlet? Or is this guessed from the use of na?
Why is connects incorrect? As in, she connect the fridge into the outlet?
I did the same thing! However, now that I think about it, I think this would be awkward. I don't know if you are a native english speaker, but I would say connect would be when two things come together. A better way using connect would be "She connects the fridge to the outlet" as in you are bringing those things together. Plug is used when one object is being brought to the other object and you use "into". Regardless, If someone said this in Portuguese, we get what they are saying.
"Socket" has two meanings specific to electricity in AmE:
She plugged the lamp into the socket in the wall (outlet).
He screwed the lightbulb into the socket. (part of the lamp)
Wow! Emeyer you're awesome ... Always enlightening. You're my inspiration (Nossa! Emeyer você é demais ... Sempre esclarecedora. Você é minha inspiração ...).