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

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

Part One: Tutoring from Famous Teachers

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. Study the relationship between the voltage of the series battery pack and the voltage of each cell.

Analysis of typical cases

[Example] As shown in the figure, the power supply is two dry batteries connected in series. The ammeter reading is 0.5A and the voltmeter reading is 1.4V. Then the current through the two lamps I1=________A, I2=________A, and the voltage across L1 is U1 =________V, the voltage across L2 U2 =________V.

[Analysis] Use the relationship between the voltage of the series battery pack and the voltage of each battery as well as the relationship between the current and voltage in the series circuit to solve problems.

Error-prone warning

[Example] In the circuit shown in the figure, when the switch S is closed, the voltage measured by the voltmeter is ()

A． The voltage across lamp L1

B． The voltage across lamp L2

C. Lamp Voltage across L1 and L2

D. voltage

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

Explore the laws of voltage in series circuits

In an experiment to explore the voltage patterns of series circuits, Xiaoyu performed the following operations:

(1) Connect two small light bulbs L1 and L2 marked "2.5V 0.3A" in series and connect them to the power supply to make the light bulbs glow (as shown in the picture);

(2) Connect the voltmeter three times, measure the voltages between AB, BC and AC respectively and record them in the table below.

UAB UBC UAC

Voltage (V) 2.45 2.50 2.60

Please evaluate: One of the measurement results in the table is wrong, the wrong one is _______, and the basis for judgment is ____________________.

Variation training

1. As shown in the figure, R1

A． Equal to 4V B. Greater than 2V

C. Equal to 2V D. Less than 2V

2. As shown in the figure, when "exploring the rules of voltage in series circuits", Xiaoyu used a voltmeter to measure the voltages at ab, bc, and ac as Uab=3V, Ubc=3V, and Uac=6V respectively, and recorded them in the table After collecting the data, the next step should be ( )

A． Organize equipment, analyze data, and draw conclusions

B． Swap the positions of L1 and L2, and then measure a set of voltage values.

C. Change the power supply voltage and measure several sets of voltage values

D. Use small light bulbs of different specifications and measure several sets of voltage values.

Explore the voltage of a series connected battery pack

In the circuit as shown in the figure, the voltage of each dry cell is 1.5V. After closing the switch, the reading of voltmeter A in Figure (1) is _______V, and the reading of voltmeter B in Figure (2) is _______V .

Variation training

3. Xiao Ming has a repeater, which requires a voltage of 6V when working. If it is powered by dry batteries, it requires _______ dry batteries_______. He also has a calculator, which requires a voltage of 3V when working. It is powered by silver oxide. To be powered by button batteries, _______ silver oxide button batteries are required. (The voltage of one silver oxide button battery is 1.5V)

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

1. As shown in the figure, the power supply voltage is 6V and the voltage representation is 3.8V. The correct one of the following statements is ( )

A． The voltage across L1 is 3.8V

B． The voltage across L2 is 3.8V

C. The sum of the voltages across the power supply and L1 is 3.8V

D. The voltage across L2 is 2.2V

2. As shown in the figure, when switch S1 is turned off and S2 is turned on, the voltmeter reads 4.5V. When switch S1 is turned on and S2 is turned off, the voltmeter reads 2.1V. Then, when S1 and S2 are both When disconnected, the voltages across the small bulbs L1 and L2 are ( )

A． 2.1 V | 4.5 V

B． 2.4 V | 2.1 V

C. 4.5V　6.6V

D. 4.5V|2.1V

3. In the circuit shown in Figure A, when the switch is closed, the pointers of the two voltmeters deflect as shown in Figure B, then the voltages at both ends of the lamp L1 and L2 are ( )

A． 4.8V　1.2V　B． 6V　1.2V

C. 1.2V　6V D． 1.2V|4.8V

4. Xiao Ming conducts an experiment according to the circuit shown in Figure A. When the electrical appliance is closed and the switch is working normally, the pointer positions of voltmeter and are exactly the same, as shown in Figure B. Then the voltage across L2 is _______V and the voltage across L1 is_ ______V.

5. The circuit connected by a classmate is as shown in the figure. The power source he uses is a battery pack composed of four new dry cells connected in series. When he closes the switch, the voltmeter reads 2V, then the voltages across L1 are _______, L2 The voltage across it is _______.

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

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Download (Lesson 2) Part One: Tutorials by famous teachers, key and 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. Code..

"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.

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

"The Rules of Voltage in Series and Parallel Circuits" Voltage Resistance PPT (Lesson 2) Part One Content: Basic Knowledge Points Rules of Voltage in Parallel Circuits 1. In the circuit as shown in the figure, the two light bulbs glow normally, and the power supply voltage is 3 V, the voltage across L1 is 3 V; if...

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Update Time: 2024-11-20

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

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