<prompt> Human: I just moved into a new apartment, and my housemate and I have gotten into the habit of turning the master switch of our fuse box which is right by the front dooroff whenever we leave the house, or are going to sleep. Will this show a significant impact on our electricity bill? I know things like phone chargers and consume electricity even when not in use, but Im assuming fuses are like light switches, where it costs a signifigant jolt of energy to turn them on, which may actually raise the cost, or worse, leave us subject to the possibility of a fuse busting. Can I get some advice on what is the best method to save money?  <response>: I dont think this is the intended usage of the main breaker. 