"Household Electricity" Exploring Circuit PPT Courseware

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"Household Electricity" Exploring Circuit PPT Courseware

1. Home circuit

1. The composition of household circuits: ________, electric energy meter, knife switch, ________, lamp holder, switch, socket, etc.

2. Connection method of each component

(1) There are usually two entrance lines, one is the ________ line and the other is the ________ line. There is a voltage of ________V between them. ________ is connected to the ground conductor buried in the earth of the residential building.

(2) The electrical appliances in the household circuit are _________connected and do not affect each other.

(3) Each electrical appliance is controlled by a switch connected to it ________. The knife switch on the main road controls ________.

(4) National standards stipulate that for household appliances with metal casings, the metal casing must ________.

3. The structure and correct use of the test pen.

2. Safe use of electricity

1. A large number of facts show that a voltage no higher than ________ is a safe voltage.

2. Electric shock accidents in household circuits are caused by direct or indirect contact of the human body with ________.

3. Types of electric shock: single line electric shock and double line electric shock.

4. Principles for safe use of electricity: Do not touch ________, do not approach ________.

Knowledge point 1: Composition of household circuits

1. In a home circuit, the correct order of circuit components is ()

A. Household lines, energy meters, main switches, protection equipment, and electrical appliances

B. House entrance line, main switch, protection equipment, energy meter, electrical appliances

C. Household lines, energy meters, main switches, electrical appliances, and protective equipment

D. Household lines, electrical appliances, energy meters, main switches, and protective equipment

2. The voltage of household circuits in my country is ()

A.380 V B.220 V

C.110 V D.36 V

3. Among the four household circuits shown in the figure, the correct one is ()

This question examines the connections of household electrical circuits. There is no fuse in the circuit in Figure A. When the current is too large, too much electric heat is generated in the circuit, burning the wires, and the circuit cannot automatically cut off. The light bulb has no switch control and keeps working when connected to the circuit, which wastes energy, so A is wrong; the fuse in picture B is connected to the neutral line. When the fuse blows, although there is no current in the circuit, the light bulb is connected to the live wire, and it is easy to get an electric shock when touching the light bulb. Accident, so B is wrong; in the picture C, when only one fuse is connected to the live wire, the fuse will blow and the live wire will be cut off, making it safer during use. The live wire enters the switch and then enters the bulb. When replacing the bulb, turn off the switch and cut off the live wire. It is safer to touch the bulb, so C is correct. In picture D, the fuse is connected to the live wire for safety, and the switch is connected between the neutral wire and the bulb. When replacing the light bulb, turn off the switch and the live wire is still connected to the light bulb. Contact with the light bulb may cause an electric shock accident, so D is wrong.

Knowledge point 2: Safe use of electricity

4. Which of the following four practices conforms to the principle of safe electricity use ()

A. Install the switch between the bulb and the neutral wire

B. After an electric shock accident, cut off the power supply first and then rescue people.

C. Wipe the burning desk lamp bulb with a wet rag

D. When using a test pen, your hand comes into contact with the metal body of the pen tip

Keywords: Exploring Circuit Teaching Courseware, Home Electricity Teaching Courseware, Shanghai Science Edition 9th Grade Physics PPT Courseware Download, 9th Grade Physics Slide Courseware Download, Exploring Circuit PPT Courseware Download, Home Electricity PPT Courseware Download, .PPT format ;

For more information about the PPT courseware "Exploring Circuits and Household Electricity", please click the "Exploring Circuits ppt Household Electricity ppt" tag.

"Household Electricity" Exploring Circuit PPT Courseware 4:

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"Household Electricity" Exploring Circuit PPT Courseware 3:

"Household Electricity" Exploring Circuit PPT Courseware 3 1. Activity 1: Understand the composition and connection methods of household circuits: household wires, energy meters, main switches, fuse boxes, sockets, switches, and electrical appliances. Self-introduction of family members in the home circuit: Entry line: I am a family member..

"Household Electricity" Exploring Circuit PPT Courseware 2:

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Update Time: 2024-07-03

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

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