Three students rent a third-floor apartment. After signing the lease, they realize there's no electricity on the third floor! They run a \(30.5-\mathrm{m}, 18\)-gauge extension cord up from the second floor and plug everything into some power strips plugged into this cord. An electrician visiting the apartment says, "You can't do that; you'll burn the house down! Get a heavy-duty cord made with 12-gauge wire." You don't see how that could make a significant difference, so you begin to look up wire sizes in a reference table.