Download the PPT courseware "Current and Circuits"

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Download the PPT courseware "Current and Circuits"

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Current

1. Which of the following statements about the formation of electric current is correct (C)

A. The movement of charges forms an electric current.

B. As long as the power supply is connected to the circuit, current will definitely form.

C. The directional movement of free electrons in a metal conductor forms an electric current.

D. The direction of current always flows from the negative pole of the power supply to the positive pole.

2. As shown in the figure, when a negatively charged object a is used to contact the uncharged metal ball b of the electroscope, the metal ball b is also negatively charged, then (D)

A. Some positive charges on a are transferred to b, and the direction of the instantaneous current is a→b

B. Some positive charges on b are transferred to a, and the direction of the instantaneous current is b→a

C. Some electrons on a are transferred to b, and the direction of the instantaneous current is a→b

D. Some electrons on a are transferred to b, and the direction of the instantaneous current is b→a

Knowledge point 2: Circuit composition

3. (Jiangxi High School Entrance Examination) A simple circuit is composed of a power supply, electrical appliances, switches and wires. When charging a power bank, the power bank is equivalent to an electrical appliance in a simple circuit; when a power bank charges a mobile phone, the power bank is equivalent to a power source in a simple circuit.

4. Which of the following items does not belong to electrical appliances (B)

A.Light bulb B.Battery

C. Electric fan D. Motor

Knowledge point 3 Circuit diagram

5. In the laboratory, Xiao Ming has connected a circuit as shown in the picture. Please draw the circuit diagram of this circuit in the dotted box.

Knowledge Point 4: Path, Open Circuit, Short Circuit

6. In the circuit as shown in the figure, when switches S1 and S2 are open, the circuit is in an open circuit state; when S1 is closed and S2 is open, the circuit is in an open state; when switches S1 and S2 are both closed, the circuit is in a short circuit state. .

7. Which of the following statements is correct (C)

A. The circuit where the switch is closed must be a path

B. A short circuit will occur when the wire is broken internally

C. Loose connecting wires in the circuit will cause an open circuit

D. When the circuit is broken, the current is very large, which may cause an accident.

Current and circuit PPT, part 2: improvement of comprehensive capabilities

8. The electric bicycle shown in the picture is popular among people. It is lightweight, energy-saving, and environmentally friendly. As long as you insert the car key into the lock and turn it clockwise, the car will be powered on, but it will not run. The car key is essentially a switch.

9. Teacher Wang demonstrated an electrical experiment to the students: take the tinfoil used to package chewing gum, cut it into strips, and connect one end of the tinned side of the tinfoil strip to the positive electrode of the battery, and the other end to the negative electrode of the battery. It was quickly discovered that Smoke began to appear in the middle of the note and a flame ignited, as shown in the picture. This is because tin foil is conductive, and if its two ends are directly connected to the positive and negative electrodes of the battery, a short circuit will occur.

10. Analogy is an important scientific research method. The following description of the formation of water flow and current and the function of the device (as shown in the figure) is incorrect (D)

A. Wires are analogous to water pipes and are devices for transmitting current.

B. A switch is analogous to a valve, which is a device that controls current transmission.

C. The power supply is analogous to a water pump, which is a device that provides electrical energy.

D. A light bulb is similar to a water turbine and is a device that generates electrical energy.

11. (Wenzhou High School Entrance Examination) Which of the following physical connections is consistent with the circuit diagram (the copper sheet of the fruit battery is the positive electrode and the zinc sheet is the negative electrode) (B)

12. Which of the following can correctly represent the direction of current in the circuit as shown in the figure (A)

①b→a　②d→c　③f→e　④f→d→b

A.1 B.2

C.3 D.4

Current and circuit PPT, the third part: Expansion, exploration and breakthrough

16. As shown in the figure is the circuit connected by Xiao Ming. After he checked that the wires were connected correctly, he closed the switch S and found that the two lights did not light up. So he connected a wire to two points ab, bc, cd and ac respectively, and the lights Neither L1 nor L2 emits light. When the wires are connected to bd, the lamp L1 emits light but L2 does not emit light. From this, it is determined that the fault of the circuit is (B)

A.Lamp L1 and switch S are both open circuit

B. Lamp L2 and switch S are both open circuit

C. Lamp L1 and switch S are both short-circuited

D. Lamp L2 and switch S are both short-circuited

Keywords: Free download of PPT courseware for ninth-grade physics from People's Education Edition, PPT download of electric current and circuit, .PPT format;

For more information about the "Current and Circuit" PPT courseware, please click on the "Current and Circuit ppt" tab.

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Update Time: 2024-11-15

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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