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

Description

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

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?

①Measure the voltage across the lamp L1

②Measure the voltage across the lamp L2

③ Voltage across the power supply

④ Repeat the above experiment by changing the specifications of the two small light bulbs.

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.

practice

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

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

"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 voltmeter used in A, B and C..

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Update Time: 2024-09-11

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

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