"Voltage" Voltage Resistance PPT Courseware 2

Description

"Voltage" Voltage Resistance PPT Courseware 2

Connect the circuit components with wires as shown in the picture.

think:

If there is no dry battery and the switch is turned off, will the light bulb still glow? Why can't current flow in the circuit in this case?

What is the function of power supply?

Compare the similarities between water flow and electric current

What are the conditions for continuous current to form in a circuit?

1. Closed circuit

2. The presence of voltage

1. Voltage

1. Voltage is the cause of current. (push charge)

2. The power supply is a device that provides voltage.

3. Voltage symbol: U

4. International unit: volt, referred to as volt (V).

Commonly used units: kilovolts (kV), millivolts (mV), microvolts (μV), etc.

1 kilovolt = 1000 volts 1 volt = 1000 millivolts 1 millivolt = 1000 microvolts

2. Measurement of voltage

1. Instrument used to measure voltage: voltmeter

Symbol of voltmeter: - V -

2. The voltmeter in the laboratory has three terminals: "—", "3", and "15"

3. Two measurement ranges: 0~3V and 0~15V

The graduation values ​​are: 0.1 volts and 0.5 volts respectively.

What information can you gain by observing the external structure of this table?

Summary: Use of Voltmeter.

(1) The voltmeter must be connected in parallel to both ends of the circuit under test

(2) When using, the current must flow in from the "+" terminal and out from the "-" terminal.

(3) The measured voltage cannot exceed the range of the voltmeter (test touch)

(4) Allow the voltmeter to be directly connected to the two poles of the power supply to measure the power supply voltage.

Think about it:

What are the similarities and differences in the use of voltmeters and ammeters?

Voltmeter and ammeter (similar points)

1. Zero calibration is required before use.

2. When using, the current must flow in from the "+" terminal and out from the "-" terminal.

3. The measured current or voltage cannot exceed the range of the meter.

【Exercise questions】

1. Voltage is represented by the letters ____.

2. The international unit of voltage is ____, abbreviated as ____, represented by the symbol ____.

3. 1 kilovolt = ____ volt, 1 volt = ____ millivolt, 1 millivolt = ____ microvolt

4. Common voltage values: one ordinary dry battery ____ volts, one storage battery ____ volts, the safety voltage for the human body is ____ volts, and the household lighting circuit ____ volts.

5. A voltmeter is an instrument used to measure the size of ____, and its symbol is ____.

6. The voltmeter used in the laboratory has three binding posts. The two ranges are ____ and ____. The minimum scale values ​​are ____ volts and ____ volts respectively.

If an electrical experiment cannot be carried out normally and you need to determine whether the dry battery is scrapped, you can take a dry battery and use a voltmeter to measure its voltage. The correct one of the following steps is ( )

① Contact the positive terminal of the voltmeter with the negative terminal of the dry battery, and the negative terminal with the positive terminal

②Read the voltage value on the dial

③Select the range of the voltmeter to 3 V

④ Contact the negative terminal of the voltmeter with the negative terminal of the dry battery, and the positive terminal with the positive terminal

⑤Select the range of the voltmeter to 15V

A. ③②① B. ①⑤③ C. ③④② D． ①④②

How to use a voltmeter:

1. Zero calibration: Check whether the pointer of the voltmeter is aligned with the zero scale line. If there is any deviation, correct it.

2. Parallel connection: The voltmeter must be connected in parallel at both ends of the circuit to be measured, so that the current flows in from the "+" terminal of the voltmeter and flows out from the "-" terminal.

3. The measured voltage cannot exceed the range of the voltmeter. Generally, the large range is selected for the test touch first. If the voltmeter's indication is within the small range, switch to the small range.

Keywords: Voltage and resistance teaching courseware, voltage teaching courseware, New People's Education Edition ninth-grade physics PPT courseware, ninth-grade physics slide courseware download, voltage and resistance PPT courseware download, voltage PPT courseware download, .ppt format

For more information about the "Voltage Voltage Resistance" PPT courseware, please click the Voltage ppt Voltage Resistance ppt tag.

"The Relationship between Current, Voltage and Resistance" PPT courseware:

"The Relationship between Current, Voltage and Resistance" PPT courseware Part 1: Introduction of the topic Please look at the following experiment and think about the problem. Please think: What can be done to dim the light bulb? Method 1: Remove a battery Method 2: Add resistance to the circuit Question: Same...

"The Relationship between Current, Voltage and Resistance" PPT:

"The Relationship between Current, Voltage and Resistance" PPT Part One Content: Thinking: Which physical quantity is most susceptible to the magnitude of the current passing through a certain conductor in a certain circuit, the voltage at both ends of this conductor, and the resistance of this conductor, which physical quantity is most susceptible to the other two Due to changes in quantity...

"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: _____ ..

File Info

Update Time: 2024-11-16

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

Preview