Hi - I just want to get a sense check on this and see I'm over-reacting or not...
We have a 22 month old boy who's fascinated by the household hoover and loves acting out cleaning with it. Perfectly fine 
However, my OH keeps showing him how to plug it into the wall socket so he can turn it on and off himself. This terrifies me as my logic says... if he understands the concept of plugging things in = fun-times, but not necessarily the dangers of electricity, it's only a matter of time before he sticks something in he shouldn't.
My OH on the other hand argues that its in fact teaching him how to safely plug things in. Argument ensues...
Be keen to hear your thoughts.