讲图片中题目生成详细的讲解视频---Here is the extraction of the content from the image: **Header:** 2. 万维原创 **Problem Description:** 电动汽车是一种绿色环保型交通工具,它采用蓄电池作为动力源。电池的安全性主要在于对温度的控制上;汽车的电池分为多组,当某一组温度过高时,就会启动制冷系统进行降温,这样使电池组的温度维持在安全范围内。图甲所示是某款电动汽车的温控系统模拟图,控制电路的电源电压恒为 6 V, Rt 为热敏电阻,其阻值与温度 t 的关系如图乙所示, 滑动变阻器 Rp 的最大阻值为 300 Ω, 当控制电路中电流大于等于 20 mA 时, 衔铁吸合, 制冷系统工作。 **Figure A Description (图甲):** * Type: Circuit diagram. * Main Elements: * Control Circuit: Includes a power source (battery symbol), a switch S, a sliding rheostat Rp, a thermistor Rt, and a relay coil connected in series. * Relay: Contains a coil, an armature, and contacts labeled a, b, and c. Contact b is the common terminal, a is a normally closed contact, and c is a normally open contact. * Cooling System (制冷系统): Connected to terminal b of the relay contacts. An implied power source for the cooling system is connected to one of the other relay contacts (a or c). **Figure B Description (图乙):** * Type: Line graph. * Title: 第2题图 (Figure for Question 2) * X-axis: Label: t/°C. Unit: °C. Represents temperature. Scale from 0 to 140 in increments of 20. * Y-axis: Label: Rt/Ω. Unit: Ω. Represents the resistance of the thermistor Rt. Scale from 0 to 200 in increments of 40. * Curve: A decreasing curve showing the relationship between Rt and t. * Labeled Points: (60, 70) and (90, 40). **Questions:** (1) 图甲中应将制冷器接线柱 b 与触点 ____ (选填“a”或“c”) 相连。 (2) 小明想利用一只电阻箱在室温条件下对上述电路进行调试,使电路能在 60 ℃时启动制冷系统。他先将电阻箱调为 70 Ω, 然后进行如下操作。 步骤一: 断开开关, 将滑动变阻器调到阻 (Sentence incomplete in image). (3) 小明观察到家里电动汽车的电池容量为 500 Ah, 电池电压为 300 V, 若该电动汽车在平直公路上匀速行驶时受到的阻力为 600 N, 电池充满电, 电动汽车将电池储存电能的 80%转化为机械能, 该车最多能行驶的路程是多少? (4) 小明想探究纯电动汽车和燃油汽车相比, 谁更省钱, 于是收集了如下资料: | | 纯电动汽车 | 燃油汽车 | |------------|------------|----------| | 每百公里能耗 | 20 kW·h | 8 L | | 单位能耗价格 | 1.5 元/度 | 8.3 元/L | 两种车型的汽车同样行驶 100 公里, 在能源消耗上哪种更省钱?