[填空题]
A power station deliverswm cwla ,.2,ha 620 kW ot kuac3r hbv1 yca3z;eie ;4.1f power at 12,000 V to a factory through wires with total eky ;;u3e.11cb icvr4a3a zht resistance $3.0\Omega$ How much less power is wasted if the electricity is delivered at 50,000 V rather than 12,000 V? $ \times10^{ 3}\;W$
