"Let the Lamp Shine" Understanding Circuits PPT Courseware 3

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"Let the Lamp Shine" Understanding Circuits PPT Courseware 3

Think about it, do it

Experiment 1: How to make a small light bulb continue to glow?

Tip: Do not connect the two ends of the battery directly together with wires.

Kind tips

When connecting a circuit, the switch must be in the off state.

Never connect the poles of a battery with a wire without passing through a small light bulb or bell.

If you find any abnormality during the experiment (such as wires and batteries heating up), please turn off the switch first and report to the teacher in time!

Pay attention to how many circuit components the circuit you are connecting consists of. How are they connected?

Think and discuss why the little light bulb lights up?

1. Circuit

1. Circuit composition

The path through which current can flow composed of power supply, electrical appliances, wires, and switches is called a circuit.

Power supply: a device that can continuously provide electrical energy to electrical appliances

Such as: dry batteries, storage batteries, generators, etc.

Electrical appliance: A device that uses electrical energy to work.

On/Off: Control the work of electrical appliances.

Wires: Connect the above devices. Transmitting electrical energy

Only when the circuit is closed can there be current in the circuit.

2. Current

1. The formation of electric current: the directional movement of electric charges forms electric current

When the switch is closed, the small bulb continues to glow, indicating that charge continues to flow through the small bulb. The directional movement of charges creates an electric current.

2. Direction of current: The direction in which positive charges move directionally is defined as the direction of current.

(1) The directional movement of free electrons is opposite to the direction of current;

(2) Outside the power supply, the direction of current flows from the positive pole of the power supply to the negative pole.

3. Circuit status

1. Path: a circuit that is connected everywhere and can work with electrical appliances.

2. Break circuit (open circuit): When the switch is not closed, or the wire is broken, causing the circuit to be disconnected somewhere, it is called an open circuit. Also called circuit break

3. Short circuit: directly connect the two ends of the power supply or electrical appliance with a wire.

4. Circuit diagram

A diagram that uses symbols to represent circuit connections is called a circuit diagram.

Requirements for drawing circuit diagrams

Component placement should be appropriate and evenly distributed.

Don't draw components at corners.

The entire circuit diagram should preferably be in a rectangular shape with edges and corners, and the wires should be horizontal and vertical.

The components should be arranged appropriately and evenly distributed, and components should not be drawn at the corners. The entire circuit diagram should preferably be in a rectangular shape with edges and corners, and the wires should be horizontal and vertical.

Requirements for drawing a circuit diagram:

(1) Use unified symbols to express.

(2) When connecting, draw the lines horizontally and vertically.

(3) Components cannot be drawn at corners (except varistor)

(4) The lines should be drawn concisely, neatly, beautifully and with reasonable layout.

practice

1. Picture A is the circuit diagram of a toy electric fan. Please connect its circuit in Picture B.

2. Connect the circuit of the electronic doorbell in the picture and draw its circuit diagram. Electronic doorbells can be represented by symbols like electronic doorbell.

3. The picture is a cross-sectional view of a commonly used flashlight. Observe its structure. How does a circuit get connected when a button is pressed? Draw its circuit diagram

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For more information about the PPT courseware "Understanding the Circuit to Make the Lamp Shine", please click the "Understanding the Circuit PPT to Make the Lamp Shine" ppt tag.

"Let the Lamp Shine" Understanding Circuit PPT Courseware 2:

"Let the Lamp Shine" Understanding Circuits PPT Courseware 2 Learning Objectives: 1. Understand the composition of circuits through experimental exploration and form the concept of circuits. Cultivate students' analytical and induction abilities, sense of competition and spirit of cooperation. 2. Know that the types of circuits include paths, open circuits and short circuits, and...

"Let the light shine" PPT courseware for understanding circuits:

"Let the Lamp Shine" PPT Courseware for Understanding Circuits 1. Composition of a circuit 1. Circuit: A current path formed by connecting _______, _______, and _______ using _______. 2. The functions of each component in the circuit (1) Power supply: the device that provides _______ in the circuit..

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Update Time: 2024-08-11

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

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