[填空题]
A power station delivers 620 kW o o 15(qigkc.bnf power at 12,000 V to a fact6h;amye 4r 8vffnu-s5ory through wires wi5umyfvn fr86s4e-h;a th total 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$
