As shown in the figure, the Zhongxing brand electric shoe dryer produced by Chongqing Sanhui uses the _ _ _ _ effect of current to effectively dry the inside of shoes at room temperature without any damage to shoes.
(1) When current passes through a conductor, the conductor will generate heat, which is the thermal effect of the conductor;
(2) In order not to influence each other, two electric heating wires are connected in parallel;
(3) In order to generate more heat, the heating wire must be made of materials with high resistance;
So, the answer is: hot, parallel, big.