"Comprehensive Self-Evaluation" Current and Circuit PPT

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"Comprehensive Self-Evaluation" Current and Circuit PPT

Contents of the first part: 1. Multiple choice questions (3 points each, 33 points in total)

1. Which of the following phenomena does not belong to frictional electrification ()

A． Put the glass rod rubbed with silk close to the scraps of paper, and the scraps of paper will be sucked up

B． When wiping the blackboard, chalk dust flew up and fell everywhere.

C. You may hear a slight crackling sound when taking off your sweater in winter

D. When walking in trousers made of chemical fiber fabrics, dust is easily absorbed on the trouser legs.

2. Usually, the following common objects belong to the group of insulators ()

A． gasoline and salt water

B． brass and graphite

C. human body and earth

D. plastics and ceramics

3. As shown in Figure 15-Z-1, under windless conditions, the cartoon-shaped aluminum foil balloon approached the electrified rod twice but did not contact, then the balloon ()

A． Uncharged

B． Positively charged

C. Negatively charged

D. The charging status cannot be judged

4. When a positively charged object touches the metal ball of the electroscope, the metal foil of the electroscope opens. This is because ()

A． The electrons of the positively charged object are transferred, leaving the metal foil with extra electrons

B． The nuclei of the positively charged object were transferred, leaving the metal foil with extra nuclei.

C. The electrons on the metal foil are transferred, leaving the metal foil lacking electrons

D. The nuclei on the metal foil are transferred, leaving the metal foil with extra electrons

Comprehensive self-evaluation PPT, part 2 content: 2. Fill-in-the-blank questions (2 points for each blank, 30 points in total)

12. When the fur rubs against a rubber rod, the rubber rod becomes negatively charged due to ________ electrons; an iron chain is dragged underneath the oil tanker because iron is ________; when a glass rod is rubbed against silk, the glass rod will be charged with ________ Charge; bring a negatively charged object close to a negatively charged light ball, and the ball will be ________ (optional "attract" or "repulse").

13. Figure 15-Z-10 shows a simplified circuit diagram of a hair dryer. A is the fan motor and B is the heating wire. To blow hot air, the switch ________ should be closed. At this time, A and B________ are connected in the circuit.

14. In Figure 15-Z-11, the power supply voltage remains unchanged. When the switch is closed, the measured currents through point A and point B are both 0.4 A. Then the current through point C in Figure A is ________A; in Figure B The current through point C is ________A.

15． As shown in Figure 15-Z-12, when the switch is closed, the reading of ammeter A1 is 1.4 A, and the reading of ammeter A2 is 0.5 A, then the current through bulb L2 is ________A; if an ammeter is used to measure the current in bulb L1 alone For current, _________ (optional "0~0.6 A" or "0~3 A") range should be selected.

16. In the circuit shown in Figure 15-Z-13, when only S3 is closed, the lights that can light up are L1 and L2, which are _________ connected. When S1 and S2 are closed, the lights that can light up are L1 and L2, which are _________ connected. If only light L1 is on, _____ should be closed and ________ should be opened. Simultaneous closing of ___________ is not allowed.

Comprehensive self-evaluation PPT, the third part: 3. Drawing questions (10 points in total)

17. (3 points) Based on the physical circuit shown in Figure 15-Z-14A, draw the corresponding circuit diagram in the dotted box.

18. (3 points) Connect the objects in Figure B according to the circuit diagram shown in Figure 15-Z-15A.

19. (4 points) Use pen lines instead of wires to connect the components in Figure 15-Z-16. (Assume the light bulb will not be burned out) Requirements:

① When switches S1 and S2 are both open, the red and green lights are not on; ② Only switch S1 is closed, and the red and green lights are not on; ③ Only switch S2 is closed, and the red and green lights are on; ④ Switches S1 and S2 are both closed, and the red and green lights are on. The light is off, but the green light is on.

Comprehensive self-evaluation PPT, part 4 content: 4. Experimental inquiry questions (18 points in total)

20. (7 points) In the experiment of "using an ammeter to measure the current passing through a certain light bulb", a student found that after closing the switch, he found that the pointer of the ammeter deflected to the position shown in Figure 15-Z-17, so he immediately turned off the switch. . but:

(1)The reason for this phenomenon during measurement is ____________________.

(2) In order to complete the experiment, the next step the student should take is_____________________________.

(3) After correcting the error, the student closed the switch again and found that the ammeter read 1.8 A. Please draw the position of the pointer in Figure 15-Z-18.

twenty one. (11 points) Xiaohai and Xiaomei do the experiment of "exploring the laws of current in parallel circuits" together.

(1) Figure 15-Z-19 A shows the circuit diagram they designed (the ammeter is not shown), and Figure B shows the physical circuit they connected when measuring the current. At this time, the ammeter measured _____ (select Fill in the current at "A", "B" or "C").

(2) Please move a wire in Figure B and measure the current at another place. Draw an "X" on the moving wire and use strokes instead of wires to connect the correct circuit. After movement, the ammeter measures the current at ________ (optional "A", "B" or "C").

(3) Measure the currents at A, B, and C as shown in the table below, and draw a preliminary conclusion: __________________ (just write the expression). Xiaomei pointed out: In order to obtain more general rules, multiple experiments should be conducted. The operation method is ____________________________.

(4) Xiaohai used the original experimental equipment, added a switch, and designed a circuit. Using this circuit, you can directly measure the currents at A, B, and C without changing the position of the ammeter, and you can also get the relationship between the three currents. Please draw the circuit diagram in the dotted box in Figure C.

Comprehensive self-evaluation PPT, part 5: 5. Calculation questions (9 points)

twenty two. Answer the questions based on the circuit diagram and current representation shown in Figure 15-Z-20.

(1) As shown in Figure A, how are the lamps L1 and L2 connected?

(2) Whose current does ammeter A1 and A2 measure?

(3) The indications of ammeters A1 and A2 can be read from the two figures B and C respectively. What are they? And find the current in the lamp L1.

Solution: (1) Electric lamps L1 and L2 are connected in parallel.

(2) Ammeter A1 measures the main circuit current, and ammeter A2 measures the current in L2.

(3) Because ammeter A1 measures the main circuit current, and ammeter A2 measures the current in L2. The main circuit current is larger than the branch current, so ammeter A1 chooses the range of 0 to 3 A, and the graduation value is 0.1 A. , the reading is 1.5 A; the ammeter A2 selects the range of 0 to 0.6 A, the graduation value is 0.02 A, and the reading is 0.5 A.

Therefore, the current in lamp L1 is: I1=I-I2=1.5 A-0.5 A=1 A.

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Update Time: 2024-11-29

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