"Measuring the Electric Power of Small Light Bulbs" Electric Power PPT Courseware 4

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"Measuring the Electric Power of Small Light Bulbs" Electric Power PPT Courseware 4

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. As shown in the picture, there is 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 ______,

(2) The rated voltage of the small light bulb is about 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's reading is slightly greater than 2.5V (maximum adjusted to 3V), and note the ammeter's reading;

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

Have you mastered it?

1. In the experiment of measuring the electric power of a small light bulb, the role of the sliding rheostat in the experiment is:

(1)______________;

(2)______________ .

See who reacts fastest

1. The two bulbs A and B are marked with "110V 25W" and "110V 100W" respectively. If the two lamps are connected in series on a 220V circuit, what may happen is ( )

A. Both lights can shine normally

B. Both lights were burned out

C. Lamp A is burned out, lamp B is intact

D. Lamp A is intact, lamp B is burned out

2. Two light bulbs "10V 5W" and "3V 1.8W" are connected in series in a circuit. It is known that both lights can emit light. What about the lighting conditions of the two lights ( ) if they are connected in parallel on the circuit? ( )

A. The "10V 5W" light is on

B. The "3V 1.8W" light is on

C. Same brightness

D. Cannot be compared

3. There are three electric lamps A, B, and C in the household circuit. Their rated powers are 40W, 60W, and 100W respectively. When they all emit light normally, the brightest one is ( ).

A. A lamp

B． B lamp

C. Bing lamp

D. Three lights are equally bright

4. 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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For more information about the PPT courseware "Electrical Power Measuring the Electric Power of Small Light Bulbs", please click the Electric Power ppt Measuring the Electric Power of Small Light Bulbs ppt tag.

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Update Time: 2024-11-11

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