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Authoritative PPT Summary
"Current and Circuits" Current and Circuits PPT (Lesson 2)
Part One Content: A Classification Practice of Knowledge Key Points
Knowledge point 1 Circuit diagram
1. Draw the symbols for the following components in the circuit.
(1) Battery: ________; (2) Bell: ________;
(3) Light bulb: ________; (4) Motor: ________;
(5)Switch: ________;
(6) Cross-connected wires: ________.
2. The circuit in Figure 15-2-9 is correct ()
3. According to the circuit diagram shown in Figure 15-2-10A, connect the physical diagram in Figure B (it is required that the wires cannot cross).
4. Draw its circuit diagram based on the physical diagram shown in Figure 15-2-11.
Knowledge Point 2: Path, Open Circuit, Short Circuit
5. The circuit has three states: a normally connected circuit is a ________ circuit; a disconnected circuit is a ________ circuit; if the current comes out from the positive pole of the power supply and returns directly to the negative pole of the power supply without passing through ________, such a circuit is _______road.
6. In the circuit shown in Figure 15-2-12, the open circuit is diagram ______, the path is diagram ________, and the short circuit is diagram ________.
7. As shown in Figure 15-2-13, after closing the switch S, the light L1________ (optional "on" or "off"), because the light L1 is _________.
Current and circuit PPT, part 2 content: Comprehensive practice of B-law method
9. In the circuit shown in Figure 15-2-15, connecting the following two points with wires will cause a short circuit: ()
A. a,c
B． b.c
C. b, d
D． d.e
10. In the circuit shown in Figure 15-2-16, after closing switches S1 and S2, the following analysis is correct ()
A. The light bulb lights up and the bell rings
B． The small light bulb lights up and the bell does not ring
C. The light bulb does not light up and the bell rings
D． The light bulb doesn't light up and the bell doesn't ring.
11． As shown in Figure 15-2-17, a classmate pressed the two ends of a thin strip of aluminum foil against the positive and negative electrodes of the dry battery, and found that the aluminum foil heated up and burned. The correct analysis about this experiment is ()
A. During the experiment, the positive electrode of the dry battery was connected to the positive electrode.
B． Using regular paper instead of aluminum foil will also burn
C. There is an open circuit in the circuit
D． This experiment can illustrate the harm caused by short circuit
12. Xiao Ming connected the circuit shown in Figure 15-2-18 during the experiment. After closing switches S1 and S2, the correct one in the following analysis is ()
A. The light bulb lights up and the bell rings
B． The light bulb does not light up and the bell rings
C. The small light bulb lights up and the bell does not ring
D． The light bulb doesn't light up and the bell doesn't ring.
Current and circuit PPT, part 3 content: Practical practice of C high-frequency examination questions
16． [2016·Chengdu]An experimental team used two identical small light bulbs to connect the circuit shown in Figure 15-2-21. When the switch was closed, it was found that both lights A and B did not light up. In order to find the cause of the fault, Xiao Zhang used a wire to check. When the wire is connected to points A and B, light A is off and light B is on; when the wire is connected to points B and C, both lights are off. It is inferred that the fault is ()
A. There is a short circuit between points A and B B. There is a circuit break between points A and B
C. There is a short circuit between points B and C D. There is a circuit break between points B and C
17． [2017·Ezhou]There is a button equivalent to a switch on the left and right armrests of the rear door of the new bus. When a passenger presses any button, a bell will sound to remind the driver that a passenger is about to get off. The circuit in Figure 15-2-22 that meets the requirements is ()
18．2017·Neijiang Please design a simple circuit that is powered by a dry battery and uses a switch to control the operation of a micro motor. Draw the circuit diagram within the dashed box below.
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