"Exploring Voltage in Series and Parallel Circuits" Exploring Simple Circuit PPT Courseware

Description

"Exploring Voltage in Series and Parallel Circuits" Exploring Simple Circuit PPT Courseware

learning target

1. Will use a voltmeter to measure voltages in series and parallel circuits.

2. Know the voltage characteristics in series and parallel circuits.

Core test point: Laws of voltages in series and parallel circuits

Preview before class

1. As shown in Figure 1, connect the small light bulbs L1 and L2 to the circuit in series, and use a voltmeter to connect them to the circuit respectively to measure the voltages at the ab end, bc end, and ac end, then Uac = ________, from which we can draw the conclusion: In a series circuit____________________.

2. Connect the voltmeter between ab, cd, and ef in the parallel circuit shown in Figure 2. The measured voltages are U1, U2, and U respectively. Then their relationship is ________. From this, we can draw the conclusion: In a parallel circuit____________________

3. If 20 identical small bulbs are connected in series in a 220 V circuit, the voltage across each small bulb is ________V. If 20 identical small bulbs are connected in parallel in a 110 V circuit, each small bulb will The voltage across the bulb is ________V.

Lectures in class

Knowledge point 1. Voltage relationship in series circuits

Through experimental exploration, it was found that the voltage at both ends of the series circuit is equal to the sum of the voltages at both ends of each part of the circuit, that is

[Example 1] In the circuit shown in the figure below, when the switch S1 is closed and S2 is open, the voltage is 3V. When the switch S1 is open and S2 is closed, the voltage is 5V. Then the voltage across the bulb is _ _____ V, the voltage across the bulb is ______V. The power supply voltage is ______V.

[Exercise 1] (2014·Jieyang) In the experiment of exploring the voltage relationship of series circuits, the physics experiment team measured the V reading as 3.8V, the V1 reading as 2.3V, and the V2 reading as shown in the circuit. Should be( )

A. 1.5V

B． 3.8V

C. 2.3V

D. 6.1V

[Exercise 2] In the circuit as shown in the figure, when the switch is closed, the reading of V1 is 2V and the reading of V2 is 6V, then the voltage across the bulb L1 is ____V, the voltage across the bulb L2 is ____V, and the power supply voltage is _ ___V.

In-class testing

1. (2014•Guilin) ​​In the circuit shown in the figure, switch S is closed, the power supply voltage is known to be 6V, and the voltage across L1 is 2V, then the following statement is correct ( )

A. The voltmeter reads 2V

B． The voltmeter reads 4V

C. The voltmeter reads 6V

D. The voltmeter reads 10V

2. (2014·Baise) In the circuit as shown in the figure, when the switch S is closed, both small bulbs light up. At this time, the readings of the voltmeters V1 and V2 are 6V and 2.5V respectively. Which statement about the voltage across the small light bulbs L1 and L2 is incorrect ( )

A. The voltage across L1 is 2.5V

B． The voltage across L1 is 3.5V

C. The voltage across L2 is 2.5V

D. The total voltage across L1 and L2 is 6V

3. (2014·Nanning) As shown in the figure, during the "Exploring the Voltage Law of Series Circuits" experiment, close the switch and use a voltmeter to measure the voltages at both ends of AB, BC and AC respectively as UAB=1.5V, UBC= 1.5V, UAC=3V, after recording the data in the table, the next experimental steps are ( )

A. Arrange the equipment and end the experiment

B． Analyze data and draw conclusions

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

D. Switch to another range of the voltmeter and measure another set of voltage values.

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For more information about the PPT courseware "Explore Simple Circuits and Voltage in Series and Parallel Circuits", please click the Explore Simple Circuits ppt and Explore Voltages in Series and Parallel Circuits ppt tag.

"Exploring Voltage in Series and Parallel Circuits" Exploring Simple Circuits PPT Courseware 2:

"Exploring Voltage in Series and Parallel Circuits" Exploring Simple Circuit PPT Courseware 2 Teaching Objectives: 1. Be able to use a voltmeter to measure series and parallel circuits. Learn the basic skills of connecting circuits. 2. Know the relationship between series and parallel voltages. [Review before class] 1. The function of voltage is______..

File Info

Update Time: 2024-06-26

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 industry PPT template

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