[填空题]
A power station delivers 620 kW och jxdmn 4704bf power at 12,000 V to a factory through wire :g9u)6ww i8)tushot6u x;er ss with total r :6swhs )uu;txetw896 igruo )esistance $3.0\Omega$ How much less power is wasted if the electricity is delivered at 50,000 V rather than 12,000 V? $ \times10^{ 3}\;W$
