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[the students] learning situation analysis set in rheostat teaching, set in the context of the zone of proximal development cognitive, emotional, also very acceptable. materials to experiment with a pencil, so that students perceive access to the circuit by changing the length of the pencil, you can easily change the circuit's current to achieve the purpose of the control circuit,ed hardy uk, but also for students to understand the working principle of sliding rheostat foundation, however,Salvatore Ferragamo outlet, due to broken pencil is easy to get the length of a long pencil is more difficult, so students can easily think of replaced alloy line wrapped around the cylinder on which the students learn the principles of sliding rheostat helpful in students' conceptual understanding of the resistance of the case of continuous distillation, can be its application in production, to expand the horizons of students in the Due to the need of information technology integration, requires the display of multimedia courseware, we need multi-media classrooms. with related presentation equipment: sliding rheostat, power, electric wire, switches, ammeter, electric light, resistance boxes, potentiometers, and structure diagram, working principle of sliding rheostat courseware, students test equipment: power supply, different types of sliding rheostat,knock off oakleys, light bulbs, switches, wires.

[1] the knowledge and skills so that students can slide out Construction and application of rheostat, rheostat sliding draw symbols and schematic.
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1 teaching analysis

2 teaching objectives
Teacher: Today we work together to try to make a brightness adjustable lamp (demo making a simple dimmer lights would be a pencil with a light bulb in series with the circuit.) Teacher: Now, if Some want to dim light bulb, you can do? health: so that even the pencil into the circuit and then a little longer.






teacher: ask a student to the podium before the operation. Qingtongxuemen observed and found to can indeed access to the circuit by making the length of resistance wire to achieve the purpose of dimming, but the operation is very easy, you need to move away from too much back and forth, and even then you can achieve the purpose, the lamp of light and dark changes are limited. Teacher: Through this experiment, we seem to find a rheostat to control the current method, but we have found that the current range of light and dark and light bulb changes are very limited students, let us discuss, in order to Resistance range bigger,tods shoes outlet, how do we improve this equipment (pencil) it? Health A: pencil and easily broken, with the wire (alloy wire). Health B: too long, can turn the alloy wire wound into a coil turn. Teacher: What kind of objects around in on? close after the coil turn-around how to do? Health C: around the insulator, such as a ceramic tube, a wooden stick on; to turn on each other to prevent the coil can be alloy wire coated with insulating paint, students demonstrate their thinking process of development, the teacher in this process given the use of problem situation,

difficult: 1. the proper use of sliding rheostat 2. correct analysis of the circuit sliding rheostat direction of movement of the vane circuit current changes with the correspondence between the 4 process of teaching the process of teaching 4.2 4.1 teaching processes to create situations designed to introduce the subject division 4.2.1: experimental study on the lesson and we explore the We use the knowledge learned to explain some of the What it by changing the brightness and volume change it? (students to think) Enlightenment: in a certain voltage,mbt cipő, the current change is because of what's changed? students to discuss and answer: resistance. Teacher: factors affecting the size of many conductor resistance, Which factors do you think should be changed to the more convenient? (students answer) Enlightenment: the size of several factors affecting resistance, the conductor material is not convenient to change the conductor cross-sectional area is also difficult to change, change is relatively easy conductor length.


4. students through the operation of the rheostat to use, explore and summarize a valid connection obtained rheostat.
[Analysis] materials, experimental equipment, this section is the middle part of the physical electricity of the key elements in the test request, the contents of this section has always been an annual exam will test sites in one textbook to Xiaoming, Xiaohua study design dimming light of the total task, the research results in the section of this chapter based on the method of changing the current in the circuit to do further research by way of discussion to guide students by changing the resistance of the current approach to continuous change due to many factors affect the size of the resistance, materials This optimizes the selection method is proposed to change the access circuit conductor length is caused by continuous changes in the simplified circuit current approach, while, through the issue of guidance for students to quickly master the use of sliding rheostat for paving the way, the students on the basis of independent experimental so that students can slide rheostat in the circuit have a preliminary understanding of the role of the basic sliding rheostat control wiring can be required to correctly access the slide rheostat circuit.

attitudes and values] [5 students the skills to use electrical equipment and good habits, so that students in the experiment and gradually form a good spirit of cooperation.
2. will analyze a simple sliding rheostat in the circuit caused by current changes in how to learn the proper use of rheostat.

3 [] process and methods through discussions, students gradually build on the knowledge of sliding rheostat works.
3 teaching points, difficult to focus on: 1. rheostat works to master 2. learn effective sliding rheostat connection.
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