高中课本从减小输电线功率损耗的角度论证了远距离高压输电的必要性,本文再从电路中电压电流电功率之间的因果关系角度论证了远距离高压输电的必然性。 High school textbooks demonstrate the necessity of long-distance high-voltage transmission from the perspective of reducing the power loss of transmission lines. This paper demonstrates the necessity of long-distance high-voltage transmission from the perspective of the causal relationship between voltage and current power in the circuit.