"Brightness Problem of Light Bulb" Electric Power PPT

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"Brightness Problem of Light Bulb" Electric Power PPT

Type 1 Rated power and actual power

1. The brightness of a light bulb is determined by ________. When the same light bulb is connected to different voltages, the ________ of the light bulb does not change. (Please fill in "rated power" or "actual power")

2. Two household light bulbs A and B are marked with "220 V | 40 W" and "24 V | 40 W" respectively. When they emit light normally in their respective circuits ()

A. The A light is brighter

B. Light B is brighter

C. Both lights are equally bright

D. Unable to compare the brightness and darkness of the two lights

3. Let lamp A marked with "36 V | 40 W" and lamp B marked with "100 V | 60 W" work at their respective rated voltages, then the lighting situation is ()

A.Light A is on B.Light B is on

C. Same brightness D. Unable to determine

4. Two light bulbs, A is marked with "110 V | 40 W" and B is marked with "220 V | 25 W". Compare their brightness. Which of the following statements is correct ()

A.A must be brighter than B

B. B must be brighter than A

C. When both are working normally, A is brighter than B.

D. When both are working normally, B is brighter than A.

5. When the following four lamps are connected to a circuit with a voltage of 6 V, the one with the highest actual power (the filament resistance remains unchanged) ()

A. “18 V | 18 W” B. “12 V | 24 W”

C. "9 V | 36 W" D. "6 V | 12 W"

6. A lamp A marked with "10 V 5 W" and a lamp B marked with "6 V 1.8 W" are connected in series to the circuit. If both lamps can emit light, then the statement about the actual brightness of the two lamps is correct. Yes (regardless of the effect of temperature on filament resistance) ()

A.Light A is brighter B.Light B is brighter

C. The brightness of the two lights is the same D. The above three situations are possible

Type 2: Brightness problem of light bulbs in series circuit

7. Small bulb A with the specification "2.5 V 0.3 A" and small bulb B with the specification "3.8 V 0.3 A" are connected in series at both ends of the 3 V power supply. Which bulb is brighter (the filament resistance remains unchanged) ()

A. Bulb B is brighter B. Both bulbs are equally bright

C. Bulb A is brighter D. Incomparable

8.2017·Taizhou As shown in Figure 1-ZT-1, it is the circuit connected by Xiao Ke. After the switch is closed, it is found that the light L2 is brighter than L1. The correct analysis of this circuit is ()

A. The current through L2 is greater than the current in L1

B.The resistance of L2 is greater than the resistance of L1

C.The voltage across L2 is smaller than the voltage across L1

D.The actual power of L2 is smaller than the actual power of L1

9. Light bulbs L1 and L2 marked "12 V 12 W" and "12 V 6 W" respectively (assuming that the filament resistance does not change with temperature), if they are connected in series to a certain power supply, both lamps will light up. Which of the following statements is correct? yes()

A.Lamp L1 is brighter than lamp L2

B. The ratio of the voltages across lamps L1 and L2 is 2:1

C. The ratio of currents passing through lamps L1 and L2 is 2:1

D. The actual power ratio of lamps L1 and L2 is 1:2

10. Connect the bulb L1 marked "6 V 9 W" and the bulb L2 marked "12 V 36 W" in series and connect them to both ends of the power supply. One of the bulbs emits normally, and the other does not reach the rated power (regardless of the filament) resistance changes with temperature), then ()

A. The power supply voltage is 18 V

B. The current in the circuit is 3 A

C. The total power of the two bulbs is 27 W

D. The actual power of lamp L2 is equal to the actual power of lamp L1

Keywords: Free download of PPT courseware for ninth-grade physics from the People's Education Press, PPT download on the brightness problem of light bulbs, PPT download of electrical power, .PPT format;

For more information about the "Brightness Problem of Electric Power Bulbs" PPT courseware, please click the "Brightness Problems of Electric Power Ppt Bulbs" ppt tag.

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Update Time: 2024-06-24

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