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

Description

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

Knowledge review

1. The function of voltage is_______________.

2. The symbol of voltage is _______. In the International System of Units, its unit is _____, represented by the symbol ____.

3. The voltage of a dry cell battery is ____ volts.

4. The voltage of a normal lighting circuit in a home is ______ volts.

5. The safe voltage of the human body should not be higher than _____ volts.

6. The voltage of a battery is ____ volts

How to use a voltmeter:

(1) Observe whether the voltmeter is pointing at zero scale

(2) Current must flow in from the positive terminal and out from the negative terminal. Otherwise, the voltmeter pointer will deflect in the reverse direction and damage the ammeter. "Positive in and negative out"

(3) Select the appropriate range. The measured voltage cannot exceed the range of the voltmeter.

(4) The voltmeter must be connected in parallel with the circuit under test

(5) The voltmeter can be directly connected to the two poles of the power supply without going through electrical appliances. Measure the supply voltage.

1. The rules of voltage in series circuits

Ask the question: What is the relationship between the voltage across each part of the circuit in a series circuit and the total voltage?

Conjecture: The total voltage across a series circuit is equal to the sum of the voltages across each part of the circuit.

Explore experiments:

In order to test your conjecture, how should you design an experiment? Ask each group to develop an experimental plan and clarify the following questions in the plan:

(1) In order to compare the voltages across each part of the series circuit, what instruments do we need?

(2) How to measure?

(3) How many times are you going to measure?

(4) What to do after measurement?

(5) What are the experimental procedures?

(6) Can you draw a circuit diagram?

2. The rules of voltage in parallel circuits

Ask the question: What is the relationship between the voltages at both ends of each branch in a parallel circuit?

Conjecture: The voltages at both ends of each circuit in a parallel circuit are equal.

Please follow the process in which we just explored the relationship between the total voltage at both ends of the series circuit and the voltage at both ends of each part of the circuit in the series circuit, and explore the relationship between the voltages at both ends of each branch in the parallel circuit.

practice

1. Xiaoming used lamps L1 and L2 with different specifications connected in series and then connected them to the circuit for experiments. The voltage at both ends of L1 measured with a voltmeter was 3.5V, and that of L2 was 2.5V. The total voltage of the two lamps connected in series was ____V.

2. Then Xiaoming connected lamps L1 and L2 with the same specifications in series and connected them to a 6V circuit. Use a voltmeter to measure the voltage across the lamp L2 as 3V, then the voltage across the lamp L1 is _____V.

3. Lamps L1 and L2 are connected in parallel and connected to the circuit. The voltage across L2 is measured to be 3V, then the voltage across L1 is ( )

A. Greater than 3V B. Equal to 3V

C. Less than 3V D. Insufficient conditions and cannot be determined

4. Lamps L1 and L2 are connected in parallel and connected to a 3V power supply. It is found that lamp L1 is much brighter than L2. If the voltages of the two lamps are U1 and U2 respectively, then ( )

A. U1>U2 B. U1

C. U1=U2=3V D. U1+U2=3V

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For more information about the PPT courseware "Voltage Rules of Series and Parallel Circuits with Voltage and Resistors", please click on the Voltage Rules of Voltage in Series and Parallel Circuits with Voltage and Resistors ppt tag.

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Courseware 6:

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Courseware 6 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. series connection..

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Courseware 5:

"The Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Courseware 5 Review questions: 1. What are the laws of current in series circuits? The current in a series circuit is equal everywhere. Formula: I=I1=I2 2. What are the rules of the current in a parallel circuit? Main circuit current in parallel circuit, etc..

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Courseware 4:

"Laws of Voltage in Series and Parallel Circuits" Voltage Resistance PPT Courseware 4 Have you mastered it? 1. The voltmeter has ____ ranges: from 0V to 3V and from ____V to ____V. When the measuring range is 3Ⅴ, the graduation value is ____Ⅴ; when the measuring range is 15Ⅴ, the graduation value is ____Ⅴ..

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Update Time: 2024-10-05

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

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