In case of a short circuit , there would only be the small resistance of the copper wire being in opposition to the great current caused , and that is why the wire would get red-hot and a fire would be caused .

• 一旦发生短路，就会只有铜线的微小电阻未阻止所形成的巨大电流，这就是电线会炽热并引起火灾的原因。