| Category | Format | Size |
|---|---|---|
| Beijing Normal University Ninth Grade Physics Volume 1 | pptx | 6 MB |
"Current" Simple Circuit PPT Courseware 3
Description
"Current" Simple Circuit PPT Courseware 3
teaching objectives:
1. Know the formation and direction of current
2. Understand ammeters and be able to use them correctly to measure current.
3. Understand the current characteristics of series and parallel circuits
Electric current and water flow analogy
Water flowing through the turbine causes the turbine to rotate
The glow of the light bulb indicates that there is current flowing through the light bulb.
formation of electric current
Activity: Take two identical electroscopes A and B, make A charged and B uncharged. Use a metal rod to connect A and B and observe the phenomenon.
1. Current and direction of current
1. The free charges in the conductor move in a directional manner to form an electric current.
Method of inquiry: analogy
2. Regulation: The direction of directional movement of positive charges is the direction of current
3. The current in the circuit flows from the positive pole to the negative pole.
Experimental research:
What do the lights on and off in the two circuits mean?
1. Physical meaning: indicates the size of the current
2. Symbol: I
3. Unit: International unit ampere (ampere) A
Commonly used units: milliamp (mA) microamp (μA)
4. Conversion relationship
1A= 10³mA
1mA= 10³ μA
2. Ammeter
1. Symbol:
2. Function: Measure the current in the circuit
Activity 1
Observe the ammeter
①How do you know it is an ammeter?
②Where is its zero scale line?
③How many binding posts does it have? How to use binding posts?
④When using two terminals marked "-" and "0.6", what is the measuring range? What is the graduation value?
⑤When using two terminals marked "1" and "3", what is the measuring range? What is the graduation value?
⑥Think about how the ammeter should be read?
Think about how an ammeter should read?
1. Clarify the measuring range
2. Determine the current value (grading value) represented by each small grid according to the measuring range.
3. See how many large and small divisions the pointer deflects.
Activity 2 Use of ammeter
1. Before use, check whether the pointer points to zero.
2. The ammeter must be connected in series in the circuit.
3. It is absolutely not allowed to connect the ammeter directly to the two poles of the power supply without using electrical appliances, otherwise the ammeter will burn out quickly.
4. The size of the measured current does not exceed the range of the ammeter. Use the test method to select the appropriate range.
Rules for using ammeter: Two things are necessary and two things are not
(1) Before use, check whether the pointer points to zero.
(2) The ammeter must be connected in series in the circuit.
(3) Make the current flow into the ammeter from the "+" terminal and flow out of the ammeter from the "-" terminal.
(4) It is absolutely not allowed to connect the ammeter directly to the two poles of the power supply.
(5) The magnitude of the current being measured cannot exceed the range of the ammeter.
The ammeter should be connected in series in the circuit
To measure the current in a certain part of the circuit, an ammeter must be connected in series with this part of the circuit.
How to connect an ammeter when measuring the current through a small light bulb
When measuring the current in the L2 branch, how to connect the ammeter
When measuring the current in the L1 branch, how to connect the ammeter
Summary of this section
1. The formation and direction of electric current, and the units of electric current
2. Use of ammeter
(1) Check whether the pointer points to zero
(2) The ammeter should be connected in series in the circuit
(3) The "ten" and "one" terminals are connected correctly
(4) It is absolutely not allowed to connect the ammeter directly to the two poles of the power supply.
(5) The measured current should not exceed the range of the ammeter
3. Current characteristics of series and parallel circuits
practice
1. A student used an ammeter with two ranges of 0.6A and 3A to measure the current in the circuit. After testing, he chose 0~0.6A as the appropriate one. However, the scale of this range was blurred and could not be read. Another student The student saw that the pointer on the 0~3A dial pointed exactly at 2.3A, and thus judged that the actual current value was _A.
2. When using an ammeter, if the positive and negative terminals are connected reversely, the consequences will be: ( )
A. The electrical appliance was burned out. B. The power supply was burned out.
3. As shown in the figure, if IA= 0.24A, then the following relationship is correct ( )
4. As shown in the figure: IA=1.6A, I1=0.9A, I2=_____A; ID=_____A.
Keywords: simple circuit teaching courseware, current teaching courseware, Beijing Normal University edition ninth grade physics PPT courseware download, ninth grade physics slide courseware download, simple circuit PPT courseware download, current PPT courseware download, .PPT format;
For more information about the "Simple Circuit Current" PPT courseware, please click on the Simple Circuit PPT Current PPT tab.
Crazy iron skill current sound effect:
Crazy iron skill current PPT background sound effect. ..
Interference current sound effect of walkie-talkie:
Walkie-talkie interference current PPT background sound effect. ..
Current tearing sound effect:
Electric current tearing sound PPT background sound effect. ..
File Info
Update Time: 2024-06-21
This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template
"Current" Simple Circuit PPT Courseware 3 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Current" Simple Circuit PPT Courseware 3 is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Current" Simple Circuit PPT Courseware 3, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)
Preview
Related Search:
