Zhang Jiancun Liu Hanguo (Hebei Buzhuang Primary School, Baodi District, Tianjin, 301805) Design, the two terminals of the thermostat S are a and b. Its function is to automatically disconnect the circuit when the ambient temperature is higher than a certain value, the ambient temperature Below a certain value, you use the components given in the figure to form an automatic control circuit for the electric water heater. Requirements: 1. When the heating wire is heated, the green and red lights are on at the same time; 2. After the water temperature reaches a certain value, the heating wire is automatically cut off. At this time, the red indicator light is off and the green indicator light is still on; the fuse protects the circuit. (The red and green indicator lights and the heating wire are rated at 220 volts.) Analysis: There is obviously no similar student experiment in this question, and there is no mode that can be copied. By reading the effect of the thermostat, it is equivalent to a switch. As seen from requirement 2, it controls the heating wire and the red light, and must be connected in series with them. The electric heating wire and the red light may be connected in series or in parallel. How to determine the connection mode? When the electric heating wire and the red light actually work, the power of the heating wire is much larger than the power of the red lamp. If they are In series, it is known from p=/2r that the resistance of the heating wire is much larger than that of the red lamp. This is contrary to the actual situation. It can be seen that they can only be connected in parallel; it is known by requirements 1, 2, green light and electric heating wire and red light. Do not interfere with each other, only from the power supply indication, it should be connected in parallel in the circuit; from the requirements of 3, the fuse should be connected to the live line. The circuit connection is as follows.
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