"Laws of Current in Series and Parallel Circuits" Current and Circuit PPT (Lesson 1)

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"Laws of Current in Series and Parallel Circuits" Current and Circuit PPT (Lesson 1)

Part One Content: Basic Knowledge Key Points

Knowledge Points Current Laws of Series Circuits

1. The festival lanterns are composed of 22 small bulbs connected in series. The current at the power plug is 220 mA, and the current passing through the 11th lantern is 0.22 A.

2. As shown in the figure, after closing the switch, L1 is brighter than L2, and the current indicates 0.2 A. Then the current through L1 is 200 mA; the current through L2 is equal to (optional "greater than", "equal to" or "less than") 0.2 A.

3. As shown in the figure, the maximum currents allowed to pass through the light bulbs L1, L2, and L3 connected to the circuit are I1, I2, and I3 respectively, and I1>I2>I3, then the maximum current allowed to pass through this part of the circuit is ( C )

A.I1 B.I2 C.I3 D.I1+I2+I3

PPT on the laws of current in series and parallel circuits, part 2: improvement of comprehensive capabilities

4. In the circuit as shown in the figure, when the switch is closed and the two lamps emit light, the ratio of the currents passing through the two lamps is 1:1; after working for a period of time, the L1 lamp goes out but the L2 lamp still glows, then the fault in the circuit is L1 short circuit.

5. As shown in the picture, a student used three instruments to conduct an experiment of "exploring the relationship between currents in various places in a series circuit." Three instruments are best used (B)

A. Choose ammeters with different models and the same range.

B. Use ammeters of the same model and same range

C. Choose ammeters with different models and different ranges

D. Use ammeters of the same model but with different ranges

6. The river flows in a narrow river. When it reaches a wide river beach, it seems that the current is gentle. Is the current also the same? The conductor as shown in the figure has a thick end A and a thin end B. When the current flows through it, the following will occur. The correct statement is (C)

A. From A to B, the current gradually increases

B. From A to B, the current gradually decreases

C. From A to B, the current does not change

D. It is impossible to compare the magnitude of the current at both ends A and B.

The law of current in series and parallel circuits PPT, the third part: Expansion and exploration breakthroughs

7. Shown in Figure A is Xiao Ming’s experimental circuit diagram for “exploring the current characteristics of series circuits”.

(1) It is best for Xiao Ming to choose two small light bulbs with different specifications (optional "same" or "different");

(2) When Xiao Ming connected the circuit, the light bulbs L1 and L2 turned on just after connecting the last wire. His mistake in the experimental operation was that the switch was not turned off when connecting the circuit;

(3) The following table is the three sets of data measured in Xiao Ming’s experiment: From the table data, it can be concluded that the current everywhere in the series circuit is equal;

Experiment number IA/A IB/A IC/A

1 0.3 0.3 0.3

2 0.4 0.4 0.4

3 0.2 0.2 0.2

(4) When Xiao Ming was doing the experiment, before closing the switch, the pointer of the ammeter pointed at the zero scale; when the switch was closed and tested, he found that the pointer of the ammeter swung as shown in Figure B. Please analyze the problem he has in using the ammeter. The positive and negative terminals of the ammeter are connected in reverse ____.

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Update Time: 2024-10-03

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

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