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"Measurement of Voltage" PPT download
Part One: Review:
1. What is the reason why metal conductors conduct electricity easily?
There are a lot of free charges in a conductor.
2. After the metal conductor is connected to the circuit to form a path, why is there current in the circuit?
It is the directional movement of free charges (electrons) in the wire that forms the current.
There are a large number of free electrons in metals, so they can conduct electricity. But why can electrons on metal conductors move in a direction?
Who is driving the directional movement of charges?
think:
1. In Figure 3 on the right, when the valve is opened, will the water in the water pipe flow?
2. Is this flow of water short-lived or continuous?
When the water levels in the two containers become equal, the water stops flowing and the flow of water is short-lived.
3. How to get continuous water flow in water pipes?
Add a water pump with water pressure
Voltage measurement PPT, Part 2: Voltage
1. Voltage is represented by the letter U.
2. The unit is volt, referred to as volt, represented by the symbol V.
Commonly used units include kilovolts (kV), millivolts (mV), and microvolts.
Its relations are:
lkilovolt=10³volt
l volt = 10³ millivolt
l millivolt = 10³ microvolt
The unit of voltage is named in honor of the famous Italian physicist Volta. The Voltaic battery was the world's first battery made by Volta in 1800.
observe:
1. What tools are used to measure voltage?
2. What is the symbol of the voltmeter?
3. How many ranges does the voltmeter have? What is the measuring range? What is the minimum scale? How to assign the "+" and "-" of the three binding posts? How should it be read?
4. How to use a voltmeter?
Voltage measurement PPT, part 3 content: Voltage measurement:
1. Voltmeter is an instrument used to measure voltage.
2. Symbol:——V——
3. There are two ranges: 0-3V 0-15V
4. Reading training:
5. How to use the voltmeter:
(1) Before connecting to the circuit, check whether the pointer is aligned with the zero scale line. If not, be sure to adjust it to zero.
(2) Select the measuring range correctly and test with a large range. The measured voltage cannot exceed the range of the voltmeter.
(3) The voltmeter must be connected in parallel to both ends of the circuit under test.
(4) Connect the positive terminal of the voltmeter to the positive terminal of the power supply, and connect the negative terminal to the negative terminal of the power supply.
(5) Allow the voltmeter to be directly connected to the two poles of the power supply to measure the power supply voltage.
Voltage measurement PPT, Part 4: Comparing ammeters and voltmeters
Discussion: What are the similarities and differences between voltmeters and ammeters?
Consolidation: Fill in the appropriate letters in the circles A and B of each circuit diagram to represent different electricity meters, and mark the positive and negative terminals in the diagram.
Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, voltage measurement PPT download, .PPT format;
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"Measurement of Voltage" PPT courseware download:
"Measurement of Voltage" PPT courseware download Part 1: Voltage 1. Voltage causes the free charges in the circuit to move directionally to form a current. 2. The power supply is a device that provides voltage. 3. The symbol for voltage: _____. 4. The main international unit of voltage: _____ ..
"Measurement of Voltage" PPT courseware:
"Measurement of Voltage" PPT courseware Part One: Classroom Experiment Experiment: Follow the circuit diagram as shown in the figure and connect the circuit with wires. [Demonstration] The light bulb lights up, indicating that current is generated in the circuit. Thinking 1. How is electric current formed? 2. Didn’t do it..
"Measurement of Voltage" PPT:
"Measurement of Voltage" PPT Part 1 Content: Experimental Exploration When the switch is closed, does the ammeter read? How do free electrons move when the power is not connected? Will there be current? When there is no power supply in the circuit, these charges cannot produce directional displacement...