"Exploring the Laws of Voltage in Series and Parallel Circuits" Voltage and Resistance PPT Courseware 2

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"Exploring the Laws of Voltage in Series and Parallel Circuits" Voltage and Resistance PPT Courseware 2

1. The function of a voltmeter is_______________.

2. The voltmeter should be connected to both ends of the circuit to be measured, and the current should flow from ______.

3. Name the places in A, B, and C where it is inappropriate to use a voltmeter to measure the bulb voltage.

4. Point out the reasons for the measurement indications of voltmeters A and B, and describe the correction methods.

Explore voltage patterns in circuits

1. Consolidate your understanding of voltmeters

2. Explore the voltage patterns in series and parallel circuits

3. Participate in the inquiry process and deepen scientific inquiry capabilities

observe and think

Two light bulbs of different specifications are connected in series. When the switch is closed, will both lights shine? Is the brightness of the light the same?

Ask a question

1. Why do the two lights emit light differently?

2. What does the series circuit voltage have to do with it?

1. Explore the rules of voltage in series circuits

Design experimental circuits and draw circuit diagrams.

Experimental steps

1. Adjust the voltmeter pointer to zero and check the equipment;

2. Connect the circuit according to the circuit diagram. Turn off the switch and check the circuit;

3. Use a voltmeter to measure the voltage across the lamp L1 and record it as U1;

4. Use a voltmeter to measure the voltage across the lamp L2 and record it as U2. Measure the total voltage across the lamps L1 and L2 as U and record it in the table;

5. Replace the bulb and repeat steps 3 and 4;

6． Summarize the relationship between total voltage and partial voltage.

2. Explore the rules of voltage in parallel circuits

question

1. What is the relationship between the voltage across each branch and the voltage across the power supply?

2. Is it the same as the current relationship in a parallel circuit?

3. Is it the same as the voltage relationship in a series circuit?

in conclusion

The total voltage of the parallel circuit is equal to the voltage across each branch.

Think about it, do it

Connect several batteries in series to form a battery pack, use a voltmeter to measure the voltage across each battery, and then measure the voltage across the battery pack. What's the relationship between them?

Voltage rules for batteries connected in series:

The experimental results show that the voltage across the battery pack is equal to the sum of the voltages of each battery.

experimental design:

1. A power supply, a light bulb, and a switch each form a series circuit. Use an ammeter to measure the current and a voltmeter to measure the voltage of the lamp. Draw a circuit diagram.

2. A battery, switch, and two lamps form a series circuit. Use an ammeter to measure the current and a voltmeter to measure the voltage of a lamp. Draw a circuit diagram.

1. There are currently 4 dry batteries. Among the statements about these batteries, the correct one is ( )

A. The voltage of each dry cell is the same as the total voltage of the battery pack.

B. When four dry batteries are connected in series, the total voltage is the same as the voltage of any one battery.

C. When four dry batteries are connected in parallel, the total voltage is equal to the sum of the four batteries.

D. These four dry batteries can form a 6v power supply

As shown in the figure, the power supply voltage is 3v and the voltmeter indicates 1v, then the voltages at both ends of the bulb L1 and L2 are ( )

A 1v, 2v B 1v, 1v

C 2v, 1v D Unable to determine

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"Exploring the Laws of Voltage in Series and Parallel Circuits" Voltage and Resistance PPT Courseware:

"Exploring the Laws of Voltage in Series and Parallel Circuits" Voltage and Resistance PPT Courseware Observe and think about two light bulbs of different specifications connected in series. When the switch is closed, will both lights shine? Is the brightness of the light the same? Ask a question 1. Why do the two lights emit light differently? 2..

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Update Time: 2024-10-26

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 1 industry PPT template

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