"Measuring Voltage" Understanding Circuits PPT Courseware 3

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"Measuring Voltage" Understanding Circuits PPT Courseware 3

1. Things to note during the experiment

1. When connecting the physical diagram, be sure to compare it with _______.

2. During the process of connecting the physical diagram, the switch must be in the _______ state.

3. In order to verify the universality of the research conclusion, _______ experiment can be conducted.

2. Voltage characteristics in series and parallel circuits

1. The voltage across a series circuit is equal to the _______ of the voltage across each part of the circuit.

2. The voltages at both ends of each parallel branch in a parallel circuit are ________.

Voltage characteristics in series and parallel circuits

1. The voltage at both ends of a series circuit is equal to the sum of the voltages at both ends of each part of the circuit. The series circuit has the characteristics of "voltage division". The voltages at both ends of each part of the circuit in a series circuit are not necessarily equal, but the total voltage at both ends of the circuit must be equal to the sum of the voltages at both ends of each part of the circuit.

2. In a parallel circuit, the voltages at both ends of each parallel branch are equal. However, two electrical appliances with equal voltages at both ends of the same circuit are not necessarily connected in parallel.

【example】

When doing the experiment of "exploring the voltage rules in series circuits", there were multiple light bulbs to choose from. Xiao Ming connected two light bulbs L1 and L2 in series and connected them to the power supply, as shown in the figure.

(1) When the voltmeter is connected to two points A and B, two points B and C and two points A and C in the figure, the data measured after closing the switch are: UAB=0, UBC=12 V, UAC =12 V, the fault may be ____.

(2) After troubleshooting, the experiment was carried out normally, and two sets of experimental data were obtained through measurement as shown in the table below:

Knowledge point 1: Voltage characteristics in series circuits

1. In the circuit as shown in the figure, when the switch S is closed, the reading on the voltmeter will be ()

A. remains unchanged B. increases

C. Decrease D. Unable to determine

2. As shown in the picture, it is a circuit diagram used by Xiao Ming to explore "Characteristics of Voltage in Series Circuits". The following statement is correct ()

A.UAB must be equal to UBC

B.UAB must not be equal to UBC

C.UAB must be larger than UBC

D.UAC must be equal to UAB plus UBC

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Update Time: 2024-10-03

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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