"Understanding Circuits" Simple Circuit PPT Courseware 4

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"Understanding Circuits" Simple Circuit PPT Courseware 4

Assembling circuit competition

Two requirements:

1. Let the small light bulb shine, or the motor rotates or the bell makes a sound.

2. It can conveniently control small light bulbs to light up, motors to rotate or bells to sound.

A little note:

It is prohibited to use wires to directly connect the two ends of the battery.

Power supply: a power supply device that provides electrical energy and converts other forms of energy into electrical energy.

Gas Station: The battery has positive and negative poles. The positive electrode on the battery is represented by "+" and the negative electrode is represented by "-". Current is the directional movement of charge. The external current of the power supply flows from the positive electrode to the negative electrode.

Electrical appliances: electrical components that consume electrical energy and convert electrical energy into other forms of energy.

1. The composition and function of the circuit

Power supply: power supply component that provides electrical energy.

Electrical appliances: electrical components that consume electrical energy.

Switch: Control the on and off of the circuit and control the transmission of electrical energy.

Wire: current path, channel for transmitting electrical energy.

Path: A circuit that is connected everywhere.

Features: There is current in the circuit and it works with electrical appliances.

Break: An electrical circuit that is broken somewhere.

Features: There is no current in the circuit and the electrical appliances will not work.

Observe and think

1. What happens to the current in the circuit after the wire is connected?

2. Is there any current flowing through the electrical appliance (light) after the wire is connected?

3. If there is no fuse and ordinary wires are difficult to fuse, what will be the consequences?

Short circuit: directly connect the positive and negative poles of the power supply with wires without using electrical appliances.

Characteristics of a short circuit: There is a large current in the circuit and no electrical appliances are used.

Hazards of short circuit: burning out the circuit (wires and power supply) and causing fire.

Small scale chopper

1. Which of the following statements about circuits is wrong ( )

A. A power supply is a device that provides electrical energy

B. Only when the circuit is closed, there is current in the circuit

C. Current flows in the direction of "positive electrode → electrical appliance → negative electrode →"

D. Electrical appliances are devices that convert other forms of energy into electrical energy.

2. In the circuit shown in the figure, when the switch is closed, the small light bulb can emit light ( )

3. In the picture on the right, circuit A is called _____, and circuit B is called _______ (fill in "path", "open circuit" or "short circuit").

Draw the following circuit component symbols:

(1) Electric light ( )

(2) Electric motor ( )

(3) Battery ( )

(4) Switch ( )

(5) Electric bell ( )

(6) Cross-connected wires ( )

Things to note when drawing circuit diagrams:

Use pencil to draw pictures, and symbols should be standardized;

Horizontal and vertical, rectangular in shape;

Components should be evenly distributed on the circuit diagram;

Do not draw circuit components on the corners;

There should be close contact between wires and components.

after class homework

One AA battery rotted in the ground can make 1 square meter of soil permanently lose its use value. One button battery can pollute 600 tons of water, which is equivalent to a person's lifetime drinking water! What are the dangers of used batteries? How should we dispose of used batteries?

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For more information about the PPT courseware "Simple Circuits to Understand Circuits", please click the Simple Circuits ppt to Understand Circuits ppt tag.

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Update Time: 2024-11-10

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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