"Circuit Analysis and Application" PPT courseware

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"Circuit Analysis and Application" PPT courseware

Part One: Characteristics of Series Circuits

①The current in a series circuit is equal everywhere.

I=I1=I2=……

②The total voltage across the series circuit is equal to the sum of the voltages across the series conductors.

U=U1+U2+……

③Calculation formula of total resistance of series circuit

R=R1+R2+……

When conductors are connected in series, it is equivalent to increasing the number of conductors.

Other features: The switch controls __ or __ of two lights at the same time.

Circuit Analysis and Application PPT, Part 2: Characteristics of Parallel Circuits

①The current in the main circuit of a parallel circuit is equal to the sum of the currents in each branch.

I=I1+I2+……

②The voltages at both ends of the parallel circuit are equal.

U=U1=U2=……

③Calculation formula of total resistance of parallel circuit

R=R1·R2/R1+R2

When several conductors are connected in parallel, it is equivalent to increasing the number of conductors.

Circuit Analysis and Application PPT, Part 3: Application

1. Are the electrical appliances in the household circuit connected in parallel or in series?

What evidence is there?

2. What is the relationship between currents in parallel circuits?

3. Why do we need to install fuses or air switches in household circuits?

Prevent the circuit from being overloaded and damaging the power supply, or the wires from being overheated and causing a fire.

Circuit Analysis and Application PPT, Part 4: Practice

1. R1=12 ohms. Connect it in series with R2 and then connect it to an 8-volt power supply. It is known that the voltage across R2 is 2 volts. Find the resistance of R2.

2. Lamps L1 and L2 with resistances of 10 ohms and 20 ohms are connected in series. It is known that the voltage across lamp L1 is 5 volts, then the voltage across lamp L2 is ( )

A. 5 volts b. 10 volts

C. 20 volts D． 30 volts

3. If two lamps with a resistance ratio of 1:2 are connected in series, the ratio of the current passing through the lamp and the ratio of the voltage across the lamp are respectively ( )

A. 1:2 1:2 B. 1:1 1:2

C. 1:1 1:1 D. 1:2 1:1

4. If the lamps L1 and L2 with a resistance ratio of 1:5 are connected in parallel in the same circuit, the ratio of the voltages across the lamps L1 and L2 is ( )

A. 1:5 b． 5:1 C. 1:1 D. 25:1

5. Lamps L1 and L2 are connected in parallel. It is known that the resistance of lamp L1 is 10 ohms, the resistance of lamp L2 is 5 ohms, and the current flowing through lamp L1 is 0.2 A, then the current flowing through lamp L2 is ( )

A. 0.2A B． 0.4A

C. 0.1A D． 0.8A

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, circuit analysis and application PPT download, .PPT format;

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"Circuit Analysis and Application" PPT:

"Circuit Analysis and Application" PPT Part One: Characteristics of Series Circuits Total current I=I1=I2 The current in a series circuit is equal everywhere. The total voltage U=U1+U2 The total voltage across the series circuit is equal to the sum of the voltages across the series conductors. Total resistance R=R1+R2+ ..

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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