stealing power from dryer?

K im home by my self for the next couple of days lol and all i know is that my husband went to a hydro store bought some kinda breaker , installed it by the dryer , the dryer is plugged into it and there is a new breaker thing downstairs by our grow room that an electrician wired, and has built in timer. 1 side says 120v the other says 240 and i know our lights and everything is plugged into it. Now.... Can i run my dryer when my lights in the grow room are on ? or No? lol

on your breaker box there should be something that tells you the maximum electrical current you can run, from there its just a matter of adding up exactly how many watts your running.