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1.器材:一只普通收音机的喇叭、电流表、滑动变阻器、开关、电池组、导线、乒乓球. 2.电路图: 3.演示方法: 照图所示的电路图连接好电路,喇叭平放桌上,纸盆开口向上,在纸盆中放一乒乓球,让学生观察用不同电阻值时,接通和断开电路的瞬间情况,从电流表的示数、喇叭发出声音的大小及乒乓球跳起的高低,能很好地验证振幅对响度的影响,收到良好的教学效果.
1. Equipment: An ordinary radio speaker, ammeter, sliding rheostat, switch, battery pack, wire, table tennis. 2. Circuit diagram: 3. Demonstration method: Connect the circuit according to the circuit diagram shown in the figure, the speaker lay flat on the table The paper cone opens upwards. Place a table tennis ball in the paper cone to allow students to observe the momentary situation of turning on and off the circuit when using different resistance values. From the current meter’s display number, the size of the horn’s sound, and the ping-pong ball The level of good, can well verify the impact of amplitude on loudness, received good teaching results.