"Measurement of Current" Current and Circuit PPT Download

Description

"Measurement of Current" Current and Circuit PPT Download

Part One: Tutoring from Famous Teachers

Difficult points

1. Electric current is a physical quantity that represents the strength of the current, represented by the letter I.

2. The unit of electric current is ampere, or ampere for short, and its symbol is A.

3. An ammeter is an instrument that measures electric current.

Analysis of typical cases

[Example] When a certain electrical appliance is working normally, the current measured through it is 4A, then this electrical appliance may be () in the picture

[Analysis] Learn about the approximate current values ​​of some household appliances when they are working through textbooks or other means. It is clear that a current of 1A is relatively strong.

Error-prone warning

[Example] As shown in the figure, during the experiment of practicing using an ammeter, a student found that the scale value of the ammeter (0~3A) was unclearly marked. According to your understanding of the ammeter, the correct reading of the ammeter is ()

A. 0.42A B. 0.44A

C. 2.2A D. 2.4A

[Error-prone analysis] Before using an ammeter to measure current, you must understand the selected range and division value. And figure out the multiple relationship between large and small ranges.

Current measurement PPT, part 2: basic training

The strength of the current

Among the four scientists shown in the figure, the one who named the unit of electric current is ()

Variation training

1. Among the two electrical appliances shown in the figure, A is a common household electric fan with a working current of about 300mA, and B is a high-power motor with a working current of 15A. Then the electrical appliance with a larger operating current is ______, and the large current is ______ times the small current.

Measurement of current

As shown in the figure, it is an ammeter commonly used in physics laboratories. To use it to measure the current passing through a certain component in a circuit, the ammeter must be connected to the component, and the current must be ______ from the ammeter. The _connection post flows in and the ______ terminal post flows out. The maximum current passing through the ammeter must not exceed the ______ of the ammeter; be sure to prevent the two terminals of the ammeter from being directly connected to _______________ without passing through the electrical appliances in the circuit. .

Variation training

2. As shown in the figure, Xiao Ming measured the current in the same circuit. The two readings on the ammeter dial are as shown in Figures A and B. Obviously, Figure A uses the ______ measuring range, and Figure B uses the ______ measuring range. The two indications are ______ and ______ respectively. The current in this circuit can be measured more accurately using the ______ range.

3. In the group experiment of "measuring current with an ammeter", students A, B, and C found that their ammeter pointers were all at zero before closing the switch. When the switch is closed and tested, it is found that the pointer of the ammeter swings in three situations as shown in Figure A, B, and C respectively. Please analyze what problems they have with the use of ammeters and write them on the horizontal line below.

(1) Student A’s question: Ammeter____________;

(2) Student B’s question: Ammeter____________;

(3) Student C’s question: Ammeter ____________.

Current measurement PPT, part 3: Consolidation and improvement

1. Regarding the use of ammeters, which of the following statements is incorrect ( )

A. If the pointer of the ammeter is not at the "0" point before use, it must be calibrated.

B． The ammeter should be connected in parallel in the circuit under test

C. When the current in the circuit cannot be estimated, the touch test method should be used to determine the range.

D． Never connect the "+" and "-" terminals of the ammeter directly to the two poles of the power supply.

2. As shown in the figure, the ammeter can directly measure the current through the light bulb L2 ( )

3. As shown in the figure, the circuit that can directly measure the current through the lamp L2 is ( )

4. In the circuit shown in the figure, when the switch is closed, the ammeter measures ( )

A. Current through lamp L1

B． Current through lamp L2

C. The sum of the currents through lamp L1 and lamp L2

D． Total current of the power supply circuit

5. The current passing through a certain light bulb is 0.18A, which is equal to ______mA, which is equal to ______μA; while the current passing through a certain electronic watch is only 2μA, which equals ______A.

6. Connect the ammeter A in Figure A between points A and B in Figure B to measure the current in the circuit. The positive terminal of the ammeter should be connected to ______ (optional "A" or "B"). If the current in the circuit is approximately is 0.4A. Then choose ______A as the measuring range of the ammeter.

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For more information about the "Measurement of Current and Circuit Current" PPT courseware, please click the "Measurement of Current in Current and Circuit ppt" ppt tag.

"Measurement of Current" Current and Circuit PPT Teaching Courseware:

"Measurement of Current" Current and Circuit PPT Teaching Courseware Part One: Knowledge Management 1. Current Definition: A physical quantity that represents the strength of an electric current. I represents the electric current. Unit: In the International System of Units, the unit of electric current is ampere, referred to as ampere (A). electric current...

"Measurement of Current" Current and Circuit PPT:

"Measurement of Current" Current and Circuit PPT Part One Content: A Classification Practice of Knowledge Points Knowledge Point 1 Strength of Current 1. In physics, electric current represents the ______ of electric current, its symbol is ______, and its international unit is ______; units smaller than it are ________..

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Update Time: 2024-11-22

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

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