I rent a house in the US and recently have decided I’d like to add a refrigerator and exercise treadmill to my garage. The washer and dryer are already plugged into a receptacle in the garage so I was hoping that the new additions could plug into a second receptacle.
I don’t want to trip any breakers with all these new appliances, especially if they were all to run at the same time so I tried to figure out if the washer/dryer are on their own dedicated circuit, as well as which circuit powers the receptacle I’d like to use for the new additions.
I’m green when it comes to this sort of stuff. In my panel box there’s a circuit labeled “washer/dryer” but flipping it off does not power off anything in the house. I’ve tried the other breakers and combinations of them but nothing seems to power off the washer/dryer or the other garage receptacle. The ONLY thing that works is flipping off the 100amp double pole breaker, which shuts off everything in the house as well.
What’s going on here?
Can I safely assume that adding a treadmill and fridge to the garage won’t create excessive electrical load, since they are seemingly on a 100 amp breaker?
(I feel like I’m missing something here)

I flipped off all the breakers except for the 100 Amp, and that shut off the washer and dryer! I then flipped back on each breaker, one at a time, and checked what turned on. Pretty much everything is labeled incorrectly...and I'm confused as to why certain things are on the same circuit. It seems that the washer/dryer run on the same circuit as the bathroom lights (share a wall), as well as the outlets in 3 bedrooms that we happen to use for our PCs.
On the other hand, the 2nd receptacle in the garage is on the same circuit as the bedroom lights...
– Hunter Mar 13 '21 at 20:52And as for doing any electrical work, I have no knowledge of how to even attempt it, nor would I risk damaging part of the house or injuring myself and others. I'm simply trying to understand the implications of plugging in other objects into the outlets!
– Hunter Mar 13 '21 at 20:54