"Series and Parallel Connection" Inseparable Electrical PPT Courseware 2

Description

"Series and Parallel Connection" Inseparable Electrical PPT Courseware 2

teaching objectives

1.Knowledge and skills

Able to read and draw simple circuit diagrams.

Can connect simple series circuits and parallel circuits.

2. Process and methods

Through exploration, use experimental methods to understand the differences between series and parallel circuits.

3. Emotional attitudes and values

Be able to name examples of simple series or parallel circuits used in life and production, and develop observation skills.

Understand the impact of science and technology on social development and human life.

1. Series and parallel connection

(1) Series connection

①Definition: Power supply, electrical appliances, switches and other components are connected end to end in a certain order.

②Key points for series circuit connection:

In a series circuit, the current starts from the positive terminal of the power supply, passes through the switch, the electrical appliance, and finally returns to the negative terminal of the power supply.

③Characteristics of series circuit:

What happens to the two light bulbs when you close the switch?

Conclusion—Characteristics of Series Circuits

There is only one path for electric current, and the current passing through one element also passes through the other;

A problem occurs somewhere in the circuit, affecting the entire circuit;

The switch controls the entire circuit;

Only one switch is needed in the circuit;

The position of the switch has no effect on the circuit.

(2) Parallel connection

①Definition: Electrical appliances, switches and other components are connected in parallel and connected to the circuit.

②Key points for parallel circuit connection:

In a parallel circuit, the current starts from the positive terminal of the power supply, branches (branch) along the way, and finally returns to the negative terminal of the power supply.

③Characteristics of parallel circuit:

What happens to bulbs L1 and L2 when S2 is disconnected and S and S1 are closed?

Conclusion—Characteristics of parallel circuits

Electric current has two (or more) paths;

Each branch does not affect each other, and each component can work independently;

The switch on the main road controls the entire main road;

The branch switch only controls this branch.

Note: Dry circuit - the circuit through which all current flows.

Branch - A circuit through which part of the current flows.

Consolidation exercises

1. Determine what connection method should be used for the following circuits?

(1) The lanterns hung in our house during the Chinese New Year. ( )

(2) Electric lights, televisions, and refrigerators at home. ( )

(3) At night, the lights on the road turn on and off. ( )

(4) Fluorescent lamps in the classroom. ( )

(5) Every machine in the factory workshop must use electricity, and what connection method should be used for them. ( )

2. If one switch can control two electrical appliances at the same time, then the two electrical appliances ( )

A. Must be connected in series

B. Must be connected in parallel

C. May be connected in series or in parallel

D. Unable to judge

3. In household circuits, the connection methods of refrigerators, washing machines, and televisions are ( )

A. Must be connected in series

B. Must be connected in parallel

C. May be connected in series or in parallel

D. Unable to judge

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Update Time: 2024-11-22

This template belongs to science courseware People's Education Press Fourth Grade Science Volume 2 industry PPT template

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