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a.设计原理。电动机在风车的带动下,产生感应电流。风力越大,电动机转速越快,产生的感应电流越大,根据电流的大小,确定风力的大小。b.制作材料。电动机,万用表,高压锅气阀,自行车钢丝,瓶子,导线,乒乓球。c.制作方法。①将万用表刻度板改装成如图1所示的刻度②将两根钢丝穿入高
a. Design principles. The electric motor generates induced current under the drive of the windmill. The greater the wind power is, the faster the motor rotates and the greater the induced current is. According to the magnitude of the current, the size of the wind is determined. b. Making materials. Electric motors, multimeters, pressure cooker valves, bicycle wires, bottles, wires, table tennis. c. Production method. 1 Refit the multimeter scale plate to the scale 2 shown in Figure 1 and thread the two steel wires high