"Understanding Circuits" Simple Circuit PPT Courseware 3

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"Understanding Circuits" Simple Circuit PPT Courseware 3

Experiment: Make a small light bulb glow

1. Circuit composition:

1. Power supply: It is a device that provides electrical energy.

Dry battery (1.5V), battery (2V) (rechargeable), generator

The positive electrode of a dry battery is a graphite rod, the negative electrode is a zinc cylinder, with an electrolyte inside, metal caps on both poles, and the outside of the battery is wrapped in plastic or paper.

Lead-acid batteries for automobiles are composed of several wet cells. Utilize liquid electrolytes. A chemical battery will continue to produce electricity until the electrodes and electrolyte are used up. Rechargeable batteries undergo a reverse chemical reaction when charging.

2. Electrical appliances: devices that use electricity to perform work. (Lights, electric bells, electric fans, electric irons, etc.) Convert electrical energy into other forms of energy. For example, electric lights convert electrical energy into internal energy and light energy.

3. Switch: A device in a circuit that controls the switching on and off of the circuit. Pull cord, toggle, knife switch

There are also voice control, temperature control, light control switches, etc.

3. Three working states of the circuit

1. Open circuit: disconnected circuit.

Pathway: A circuit that is connected everywhere.

Power supply short circuit: directly connect the positive and negative poles of the power supply with wires without using electrical appliances. (It will damage the power supply and is absolutely not allowed)

4. Circuit diagram: A diagram showing the circuit connections using prescribed symbols.

Exercise: How are the flashlight batteries, bulbs, and switches connected? Generally, the shell of a flashlight is made of metal. What role does it play? How to connect the battery and bulb to a plastic-cased flashlight? Try to draw the circuit diagram of the flashlight in the picture.

answer:

① The metal shell acts as a conductor.

② The plastic-cased flashlight uses wires to connect the battery and bulb.

5. Two basic ways of circuit connection: series connection and parallel connection

1. Series connection: The method of connecting circuit components in sequence is called series connection.

In the picture, the switch controls three lights at the same time. The three lights turn on and off at the same time.

2. Parallel connection: The connection method of connecting circuit components in parallel between two points of the circuit is called parallel connection.

In the picture, each light is controlled by a switch, and several lights do not affect each other.

Find main roads and branch roads.

If one of the branches is disconnected, there will still be current flowing in the main circuit and other branches.

[Example 1] Draw the circuit diagram of the actual object as shown in the figure.

[Example 2] Connect the circuit components in the right picture according to the circuit diagram on the left, and do not cross the wires.

[Example 3] In the circuit shown in the figure, light bulbs L1 and L2 form a _____ circuit, in which switch S1 can control the light bulb _____, and switch S2 can control the light bulb _____. Draw the corresponding circuit diagram.

Answer: Parallel connection; L1 and L2; L2;

[Example 4] Open the door of the refrigerator and take a look. When does the light in the refrigerator come on and when does it go off? Think about it, are the motor and light bulb in the refrigerator connected in series or in parallel? Why?

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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.

"Understanding Circuits" Simple Circuit PPT Courseware 6:

"Understanding Circuits" Simple Circuit PPT Courseware 6 Main Contents of the Project The composition of circuits. The power supply can provide _____ devices to electrical appliances. Electrical appliances use _____ to work and convert _____ energy into _____ energy. The device switches. The installation of the control circuit _____ in the circuit...

"Understanding Circuits" Simple Circuit PPT Courseware 5:

"Understanding Circuits" Simple Circuit PPT Courseware 5 The composition of a circuit: Power supply: a device that provides electrical energy. 1. Common power sources include: dry batteries, batteries and generators 2. Energy conversion of power sources: other forms of energy can be converted into electrical energy. Electrical appliances: electrical appliances that consume electrical energy..

"Understanding Circuits" Simple Circuit PPT Courseware 4:

"Understanding Circuits" Simple Circuit PPT Courseware 4 Circuit Assembly Competition Two requirements: 1. Let the small light bulb shine, or the motor rotates and the bell makes a sound. 2. It can conveniently control small light bulbs to light up, motors to rotate or bells to sound. One note: It is prohibited to use guides..

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Update Time: 2024-11-26

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

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