"Measuring Voltage" Understanding Circuit PPT Courseware

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"Measuring Voltage" Understanding Circuit PPT Courseware

Question 1: What is voltage?

Voltage causes free charges in a circuit to __________ to form an electric current.

The role of power in a circuit is to provide __________.

Now let's think about the devices in our lives that can provide voltage:

(1) ______ is a device that provides voltage.

(2). The symbol of voltage: _____.

(3). The main international unit of voltage: _____ Abbreviation: _____,

Symbol: _____.

Commonly used units: kilovolts (kV) millivolts (mV)

Conversion relationship: 1kV=1000V 1V=1000mV

(4) Common voltages

The voltage of a dry cell: 1.5V

Safety voltage for human body: not higher than 36V

The voltage of electricity used in domestic life in my country: 220V

Do you understand?

1. Under the action of _____, charges move in a direction to form an electric current.

2. The symbol for voltage _____, the international unit is _____, represented by the letter _____.

3. (1) The safe voltage for the human body is volts

(2) The voltage of a dry cell is _____ volts = _____ millivolts

(3) The voltage of household circuits in my country is _____ volts = _____ kilovolts

Question 2: How to use a voltmeter?

(1) An instrument that measures voltage is called a voltmeter. Its symbol in the circuit is v

(2), ammeter-voltmeter

Question 3: How to use a voltmeter to measure circuit voltage?

(1) Group cooperation and exploration:

Please use a voltmeter to measure the voltage of one dry cell, two dry cells in series, and the total voltage of three dry cells in series.

(2) Explore the rules of voltage in series circuits

1. Ask questions:

2. Conjectures and Assumptions

3. Make plans and design experiments

4. Conduct experiments

5. Collect experimental data

6. Analysis and demonstration

7. Evaluation and communication

Kind tips

Experimental notes:

1. The switch should be turned off when connecting the circuit

2. Select the appropriate range of the voltmeter

3. The voltmeter should be connected in parallel with the electrical appliance being measured.

4. Do not connect the positive and negative terminals of the voltmeter reversely.

Analysis and Demonstration

From the data we can see:

The voltage across a series circuit is equal to the sum of the voltages across each part of the circuit.

UAD=UAB+UCD

Let’s talk about: What I gained from studying this course

1. The concept and unit of voltage, and common voltages in life.

2. How to use the voltmeter.

3. Measurement of power supply voltage.

4. Characteristics of voltage in series and parallel circuits.

self-test

Self-test:

1. Under the action of _____, charges move in a direction to form an electric current.

2. The symbol for voltage _____, the international unit is _____, represented by the letter _____.

3. (1) The safe voltage for the human body is _____ volts.

(2) The voltage of a dry cell is _____ volts = _____ millivolts.

(3) The voltage of household circuits in my country is _____ volts = _____ kilovolts.

4. In the circuit shown in the figure, when the switch S is closed, the voltage measured by the voltmeter is ( )

A. The voltage across the lamp L1 B. The voltage across the lamp L2

C. The voltage across the lamp L1 and L2 D. The power supply voltage

5. In the circuit shown in the figure, A and B are two electricity meters. After closing the switch S, both light bulbs can emit light, then ( )

A. A is an ammeter and B is a voltmeter. B. A is a voltmeter and B is an ammeter.

C. A and B are both ammeters. D. A and B are both voltmeters.

6. In the circuit as shown in the figure, if the voltmeter V1 reads 4.5, the V2 reading is _____V, and the V3 reading is _____V.

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Update Time: 2024-11-22

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