"Measurement of Current" Current and Circuit PPT Courseware 3

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"Measurement of Current" Current and Circuit PPT Courseware 3

1. The strength of the current

What do you think is the difference between the current running on an electric locomotive and a mobile phone?

1. Current (I): A physical quantity that represents the strength of the current.

2. Unit: Ampere, abbreviated as Ampere, symbol is A.

Common units of current:

Milliamp (mA) 1 mA=10-3 A

Microampere (mA) 1 mA =10-6 A

2. Measurement of current

1. Ammeter: An instrument for measuring current.

circuit symbol for ammeter

2. Connection of ammeter:

(1) The ammeter must be connected in series with the electrical appliance being measured.

(2) Current must flow in from the positive terminal and flow out from the negative terminal.

(3) The measuring range must be selected correctly.

(4) It is not allowed to connect the ammeter directly to the two poles of the power supply!

3. Reading of ammeter:

(1) Clarify the range of the selected ammeter;

(2) Determine the graduation value of the ammeter;

(3) Read the number from the pointer position.

4. Practice using an ammeter to measure current in a circuit

(1) Draw the experimental circuit diagram;

(2) Connect the experimental equipment according to the circuit diagram;

(3) Conduct experiments.

Tip: In order to avoid damaging the ammeter due to excessive current, if the current cannot be estimated in advance, the switch should be closed first and then opened quickly (called "test touch") to see if the deflection of the pointer is at the maximum measured value at the moment the switch is closed. within.

practice

1. Connect the physical diagram. It is required that two lamps be connected in parallel. The switch controls the two lamps. The ammeter measures the current of lamp L2 (about 0.5 A) and draws the circuit diagram.

2. Connect the physical diagram according to the given circuit diagram.

3. The switch controls _______, ammeter A1 measures the current of _______, and ammeter A2 measures the current of _______. Then draw the circuit diagram.

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

"Measurement of Electric Current" PPT courseware:

The first part of the "Measurement of Electric Current" PPT courseware content: The strength of electric current 1. Current: a physical quantity indicating the strength of electric current, symbol I 2. Unit: Ampere, symbol A. There are also milliamps (mA) and microamps (A) 3 , Current unit conversion relationship: 1A＝1000mA 1mA＝100..

"Measurement of Current" PPT:

"Measurement of Electric Current" PPT Part One Content: Teaching Objectives 1. Understand the basic concepts of electric current. 2. Know the current values ​​of some household appliances. 3. Practice and master the current measurement methods and procedures. 4. Able to read ammeter according to standard methods. 5. Can press the button...

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"Measurement of Current" Current and Circuit PPT Courseware 9 Current 1. Current intensity: Indicates the size of the current. Current intensity is referred to as the current symbol I 2. The basic unit of current: ampere, referred to as ampere, symbol A. Common units: milliamps (mA) and Microampere (A) conversion relationship: 1A=..

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Update Time: 2024-10-04

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

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