"Measurement of Current" Current and Circuit PPT Courseware 5

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"Measurement of Current" Current and Circuit PPT Courseware 5

question

Current is invisible and intangible, so how do you know there is current in a circuit? Is it the same as water flow, with strengths and weaknesses?

Compare the light output of a small light bulb when using one dry cell battery and two dry cell batteries as power source.

Phenomenon: The more batteries there are, the brighter the light will be

Note: Electric current also has strong and weak points.

1. The strength of the current

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

2. Unit: Ampere, symbol A

Milliampere (mA), microampere (µA)

3. Conversion relationship:

1A＝103 mA 1mA＝103 µA

1A=106µA

Rules for using ammeter

⑴The ammeter must be connected in series and the range must be correctly selected. First, touch the maximum range in the circuit under test.

⑵ Make the current flow in from the "+" terminal of the ammeter and flow out from the "-" terminal, otherwise the pointer will reverse.

⑶Choose the measuring range correctly, first use the maximum range to test the touch

⑷ It is absolutely not allowed to connect the ammeter directly to the two poles of the power supply. (equivalent to short circuit)

think about it

During the experiment, the following situations were found during the test, and the causes and solutions to the problems were analyzed.

1. Pointer reverse deflection:

Answer: It may be that the positive and negative terminals are connected reversely and should be reconnected.

2. The forward deflection of the pointer is too large:

Answer: This is because the range selection is too small and should be changed to a larger range.

Give it a try:

When Xiao Ming practiced measuring current with an ammeter, he recorded that the measurement result was 2.1A. Xiao Feng, who was at the same table, found that his measurement result was quite different from Xiao Ming’s measurement result, so he looked for the cause of the circuit and finally found that Xiao Ming measured 0.6A. A is measured in the range, but the problem is that the reading is based on the range of 3A, then Xiao Ming’s actual measured value should be ( )

A. 2.1A B. 0.42A

C. 2.12A D. 0.6A

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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.

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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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