"Measurement of Current" PPT courseware

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"Measurement of Current" PPT courseware

Part 1: The strength of the current

1. Current: a physical quantity indicating the strength of the current, symbol I

2. Unit: Ampere, symbol A

There are also milliamps (mA) and microamps (µA)

3. Current unit conversion relationship:

1A=1000mA

1mA=1000µA

Measurement of current PPT, part 2 content: Measurement of current:

ammeter, symbol

1. Structure of ammeter

2. Connection of ammeter

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

If the connection is reversed, the meter needle will deflect to the left, which will not only make it impossible to read, but sometimes damage the ammeter.

(2) Choose the appropriate range

When connecting an ammeter, first estimate the strength of the current. If the current to be measured is less than 0.6 A, the "-" and "0.6" binding posts should be selected; if the current to be measured is between 0.6 and 3 A, the "-" and "3" binding posts should be selected.

If you don’t know the measuring range, you should choose a larger measuring range and perform a test touch.

(3) The ammeter and the electrical appliance must be connected in series (equal to one wire)

If the ammeter is connected in parallel with the electrical appliance, the indication of the ammeter is not the current flowing through the electrical appliance, and it is easy to damage the ammeter.

Current measurement PPT, part three: summary

1. The strength of the current

Current is a physical quantity that expresses the strength of the current, I

Unit: Ampere (A), milliampere (mA), microampere (μA)

Conversion relationship: Adjacent units have a conversion rate of 1,000

2. Measurement of current

Ammeter connection

ammeter reading

Current measurement PPT, part 4: practice

1. Current is a physical quantity represented by ( ), usually represented by the letter ( ), its unit is ( ), abbreviated as ( ), and its symbol is ( ).

2. 7.5A=( )mA 5mA=( )A

50mA=( )μA 20000 μA=( )mA

6.2A=( ) μA 100 μA=( )A

3. The current in the circuit can be measured with ( ). When used, the current must flow in from ( ) and out from ( ). If the direction of the current in the meter is opposite, the needle of the meter will deflect to the ( ) side, so that not only ( ) but sometimes ( )

4. The ammeter must be connected to the electrical appliance under test ( ). When wiring, pay attention to choosing the appropriate one ( ). Under no circumstances can the ammeter be directly connected to ( ).

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, current measurement PPT download, .PPT format;

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Update Time: 2024-09-25

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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