测量小灯泡的电功

1、2022-6-271测量小灯泡的电功率测量小灯泡的电功率The electrical measuring small bulb 班级 12物理四班制作人 索娅超学号 1207020114252022-6-272目 录1. 学习目标2. 实验器材3. 实验原理4. 想一想5.实验记录 6. 交流7. 课堂小结8. 作业Learning goals The experiment equipment The experimental principle Think about it The experimental records Communication Brief summary Homewo

2、rk Directory 2022-6-273目标目标 The target 测量小灯泡的电功率实际功率额定功率用电流、电压表测The electrical mea-suring small bulb The actual power Rated power With the ammeter voltmeter 2022-6-274实验器材实验器材The experiment equipment 大家一起说说用哪些实验器材呢？Everybody together say with what equipment ？滑动变阻器、电压表、电流表、小灯泡、开关、导线。Sliding rheostat,

3、 voltmeter, ammeter, small bulbs, switches, wire. 2022-6-275 原理原理P=UI （The principle） 2022-6-2761.为什么要接滑动变阻器呢？Why want to pick up the slide rheostat? 答：为了能连续改变小灯泡两端的电压使其达到一定值，且能保护电路。lA: in order to continuously change small bulb at the ends of the voltage to make itlReaches a certain value, and can

4、protect the circuit.Think about it 2022-6-2772.怎样连接滑动变阻器？How to connect the slide rheostat? 答：应该一上一下连接，而且还要与小灯泡串联。A: should be a connection, but also with small bulb series. Think about it2022-6-278 想一想想一想 Think about it3.试验中应该测量几个量？Test should be measured in several quantity?答：根据公式P=UI，必须要测小灯泡两端电压U

5、以及流过小灯泡的电流IlA: P = UI, according to the formula must be small lights on both ends of the electrical measurementlCurrent through the small bulb voltage U and I2022-6-279 电压电压Voltage 电流Current 电功率Electric power 小灯泡亮暗 等于额定电压The rated voltage =2.5 0.5 1.25正常发光Normal light 高于额定电压Higher than the rated vol

6、tage 32.5 0.6 1.8 更亮brighter 低于额定电压Lower than the rated voltage 22.5 0.4 0.8 较暗darker 实验记录表实验记录表 Lab record 2022-6-27101.当实际U=额定U时，实际P=额定P，灯泡正常发光；2.当实际U额定U时，实际P额定P，灯泡更亮；3.当实际U额定U时，实际P额定P,灯泡更暗。4.不同电压下，小灯泡的功率不同，实际电压越大，小灯泡的功率越大5.小灯泡亮度由小灯泡的实际功率决定，实际功率越大，小灯泡越亮2022-6-2711 Communication and analysisl1.When

7、 actual rated U = U, actual rated P = P, normal light bulbl2.When actual rated U, U actual rated P, P bulb brighter;l3.When actual U rated U, actual P P, rated bulb darker.l4.Under different voltage, the power of small bulb is different, the greater the actual voltage, the greater the power of small

8、 light bulbl5.Little light bulb brightness is determined by the actual power of the small light bulb, the greater the actual power, the brighter the small bulb; 2022-6-27121，电压表指针偏的过了，出了刻度线以外，是什么原因，应当怎么处理？Voltage meter pointer declination, the scale line, is what reason, how should deal with? 2，电流表指

9、针偏转角度过小，是什么原因？应当怎么处理？Ammeter pointer deflection Angle is too small, what reason be? How should handle? Communicate my findings 2022-6-27133，电表指针反偏是为何？Why are electric meter pointer back biased? 4，你在实验中还遇到哪些问题？你是如何解决的呢？What problem you met in the experiment? How do you solve? Communicate my findings2022-6-2714课堂小结通过这节课的学习，你学到了什么呢？Brief summaryThrough the study of this lesson,What have you learned2022-6-2715 l写出测量小灯