"Measuring the Electric Power of Small Light Bulbs" Electric Power PPT Courseware 9

Description

"Measuring the Electric Power of Small Light Bulbs" Electric Power PPT Courseware 9

teaching objectives

1. Deepen your understanding of electrical power.

2. Consolidate the operating skills of ammeters and voltmeters.

3. Experience the difference between rated power and actual power through measurement.

4. Exercise students’ ability to design experimental methods based on the measurement formula P=UI.

Review questions

1. As shown in the picture is the nameplate of the light bulb, tell the meaning of "220-40":

The rated voltage of the bulb is 220V

The bulb is rated at 40W

2. The picture shows a small light bulb for experiment. It is marked with "2.5V". Do you know what "2.5V" means?

The bulb is rated at 2.5V

What should I do if I want to know the wattage rating of my light bulb?

Use an ammeter to measure the current when the small bulb is normally emitting light (voltage is 2.5V), and use P=UI to find its rated power.

conduct experiment

1. Connect the circuit according to the circuit diagram

When connecting the circuit, you should pay attention to:

(1) The switch should be ______.

(2) The rated voltage of the small light bulb is 2.5V and the resistance is about 8Ω. The ranges that should be selected for the voltmeter and ammeter are ______ and __________ respectively.

(3) Before closing the switch, the sliding rheostat should be adjusted to __________.

2. Close the switch, adjust the slider so that the voltmeter reading reaches 2.5V, and record the ammeter reading;

3. Adjust the slider so that the voltmeter reading is slightly greater than 2.5V (the maximum value can only be adjusted to 3V), and note the ammeter reading;

4. Adjust the slider so that the voltmeter reading is less than 2.5V (can be adjusted to 2V), and note the ammeter reading.

Analysis and argumentation

1. When the voltage is equal to the rated voltage, the actual power of the bulb ______ the rated power.

2. When the voltage is less than the rated voltage, the actual power of the bulb is ______ the rated power.

3. When the voltage is greater than the rated voltage, the actual power of the bulb is ______ the rated power.

【Classroom Exercise】

1. In the experiment of measuring the rated power of a small light bulb with a rated voltage of "3.8V", the power supply voltage is 6V; the power of the small light bulb does not exceed 1.5W, then the correct choice of the range of the voltmeter and ammeter is ( )

A.0~3V 0~0.6A

B.0~15V 0~0.6A

C.0~15V 0~3A

D.0~3V 0~3A

2. In the experiment of measuring the electrical power of a small light bulb (2.5V 0.5A), (1) the power supply should be at least ____ dry batteries,

(2) To measure the rated power of the small light bulb, after closing the switch, the correct operation is ____________________.

(3) The indications of the voltmeter and ammeter during a certain experiment are as shown in the figure, then the actual power of the small light bulb at this time is _____W.

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Update Time: 2024-10-03

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