"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download (Lesson 2)

Description

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download (Lesson 2)

Part One: Tutoring from Famous Teachers

Difficult points

1. Use a voltmeter to measure the voltage across each electrical appliance in the parallel circuit.

2. Summarize the rules of voltage in parallel circuits.

Analysis of typical cases

[Example] As shown in the figure, if the indication is 3V, then the indication is ________V, and the indication is ________V. From this it follows that _________.

[Analysis] First of all, it is necessary to make it clear that the three voltmeters measure the voltage at both ends of which electrical appliance respectively, and then analyze and judge based on the voltage patterns in series and parallel circuits.

Error-prone warning

[Example] As shown in the picture, two light bulbs are installed in two lamp holders on the table. When the switch is closed, the two lights will light up at the same time. A voltmeter is used to measure the voltage at both ends of the two lights to be equal. Then the following statement is made about the connection method of the two lights. the correct one is()

A． Must be in series

B． Must be connected in parallel

C. It may be in series or in parallel.

D. None of the above statements are correct

[Error-prone analysis] When electrical appliances are connected in parallel, the voltages at both ends must be equal, but when electrical appliances are connected in series, the voltages at both ends are not necessarily equal.

PPT on the rules of voltage in series and parallel circuits, part 2: basic training

Explore the laws of voltage in parallel circuits

In the experiment of "Exploring the Characteristics of Parallel Circuit Voltage", when Xiao Ming connects the circuit according to the circuit diagram as shown in the figure, the switch should be in the ______ (fill in "open" or "closed") state, and the voltmeter should be ______ ( Fill in "parallel" or "series") In the circuit, the measured voltage cannot exceed the ______ of the voltmeter. The following table shows the experimental data recorded by Xiao Ming. After analyzing and comparing the experimental data and related conditions, the preliminary conclusion that can be drawn is: ____________________.

Variation training

1. As shown in the figure, lamps L1 and L2 are connected in parallel, and the voltages at both ends measured with a voltmeter are U1 and U2 respectively, then U1:U2=______.

2. In the circuit shown in the figure, the power supply voltage remains unchanged. When the switch S is closed, L1 and L2 are both on, and the voltmeter indicates 3V. When the switch S is opened, the voltmeter indicates ( )

A． Increase to 6V B. reduced to 1.5V

C. Keep 3V unchanged D. decrease to zero

Application of voltage laws in parallel circuits

A new type of flashlight is composed of a battery, a switch and three identical LED lamp beads. When working, each lamp bead emits light normally and has a voltage of U. In order to explore the connection method of the three lamp beads, Xiao Ming took out one of the lamp beads from the shining flashlight and found that the other two lamp beads did not light up. Then the three lamp beads in the flashlight were ______ connected and the flashlight worked. When the current flowing through the three lamp beads is ______ (fill in "equal" or "unequal"), the voltage of the flashlight battery is ______.

Variation training

3. In household circuits, refrigerators consume more electricity than televisions. Which of the following statements is correct ( )

A． The voltage across the refrigerator is high

B． The voltage across the TV is high

C. The voltage at both ends of the refrigerator and television is the same

D. Unable to determine the voltage relationship between the two

The law of voltage in series and parallel circuits PPT, the third part: Consolidation and improvement

1. In the circuit shown in the figure, the resistance of L1 is larger than that of L2. The switch is closed and the lights all light up, then ( )

A. The indication is greater than the indication B. The indication is equal to the indication

C. The indication is greater than the indication D. The indication is greater than the indication

2. As shown in the figure, there are three connection methods for measuring the voltage of a parallel circuit using a voltmeter. The following statement is correct ( )

A． The sum of the measurement results of (a)(b) is equal to the measurement result of (c)

B． The measurement results of the three connection methods are the same

C. The measurement results of the three connection methods are different

D. Only the measurement results of the two connection methods (a) and (b) are the same

3. The circuit is shown in the figure. When the switch is closed, the two lights will light up. The following statement is correct ( )

A． The reading of the voltmeter must be equal to the reading of

B． The reading of the voltmeter must be greater than the reading of

C. The reading of the ammeter must be equal to the reading of

D. The reading on the ammeter must be equal to 2 times the reading on

4. As shown in the figure, the voltage of the battery pack is constant. Regarding the operation of the circuit, which of the following statements is correct ( )

A． When only S1 is closed, the two bulbs are connected in series

B． If S1 is closed first and then S2, the readings of the voltmeter and ammeter will become smaller.

C. If S1 is closed first and then S2, the readings of the voltmeter and ammeter will become larger.

D. If S1 is closed first and then S2, the voltage value remains unchanged and the current value becomes larger.

5. Connect the voltmeter to both ends of the parallel circuits ab, cd, and ef as shown in the figure. The measured voltages are U1, U2, and U respectively. Then their relationship is ____________; from this we can draw the conclusion: in the parallel circuit middle,__________________.

6． In the circuit shown in the figure, when S1 and S2 are both open, the voltage represents the power supply voltage. When S1 and S2 are both closed, the voltage represents the power supply voltage. When S1 is closed and S2 is open, Voltage represents the number ______ power supply voltage (fill in "greater than", "less than" or "equal to").

Keywords: Free download of PPT courseware for ninth-grade physics from the People's Education Press, PPT download of the law of voltage in series and parallel circuits, PPT download of voltage resistance, PPT download of voltage law of parallel circuits, .PPT format;

For more information about the PPT courseware "Voltage Laws in Series and Parallel Circuits with Voltage Resistors and Voltage Laws in Parallel Circuits", please click on the Voltage Laws in Series and Parallel Circuits with Voltage Resistors ppt Voltage Laws in Parallel Circuits ppt tag.

"The Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Teaching Courseware:

"The Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Teaching Courseware Part One Content: Guided Design Learning Point 1 Explore the voltage laws of series circuits, as shown in Figure 16-2-11, Xiaoli based on circuit diagram 16-2-10 , using the same specs of bulb design..

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download (Lesson 1):

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download (Lesson 1) Part One Content: Tutorials by famous teachers, key and difficult points 1. Use a voltmeter to measure the voltage across each electrical appliance in the series circuit. 2. Summarize the laws of voltage in series circuits. 3. research..

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download:

"The Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download Part One: Learning Objectives 1. Through experimental exploration, summarize the laws of voltage in series and parallel circuits. 2. Be able to use the laws of voltages in series and parallel circuits to analyze related problems.

File Info

Update Time: 2024-11-29

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

Preview