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【学习目标】勤于思考,学会选用不同器材,设计和连接调光电路,培养发散思维;讨论交流方案,发扬团队精神,增强协作意识;连接、调试电路,激发学习兴趣,增强动手能力;分析对比方案,并加以修正完善,体验创新,提高思维能力,热爱科学.【教与学活动安排】浓缩三维目标,教与学的过程中要充分加以体现.【学习重点及学法指导】运用欧姆定律及串联的分压原理,选用不同器材,设计多种方案,连接调光电路,相互讨论交流,追求完美,体验创新.一、课前准备题:(选用不同器材,设计调光电路)可供选择实验器材:直流学生电源(电压恒为4.5V),电灯(2.4V0.3A)、灯座、滑动变阻器(12Ω1A)、开关、电流表(量程为0～0.6～3A)、电压表(量程为0～3～15V)各一只,导线若干,各种规格的定值电阻R0可供你选用.
Learning Objectives To be diligent in thinking, learning to use different equipment, designing and connecting dimmer circuits, cultivating divergent thinking, discussing exchange programs, promoting team spirit and enhancing awareness of collaboration; connecting and debugging circuits to stimulate interest in learning and enhance practical ability; Contrast programs, and be amended to improve, experience innovation, improve thinking ability, love science. 【Teaching and learning activities arrangements】 Concentrate three-dimensional goals, teaching and learning process should be fully reflected. 【Emphasis of study and learning guidance】 The use of ohms Law and series of partial pressure principle, the choice of different equipment, design a variety of programs, connect the dimming circuit, discuss each other exchanges, the pursuit of perfection, experience innovation .A pre-class preparation questions: (choose different equipment, design dimming circuit) Optional experimental equipment: DC student power supply (constant voltage of 4.5V), lamp (2.4V0.3A), lamp holder, sliding rheostat (12Ω1A), switch, ammeter (range of 0 ~ 0.6 ~ 3A), voltmeter 0 ~ 3 ~ 15V) each one, a number of wires, a variety of ratings resistor R0 for your choice.