"Household Circuit" Daily Electricity PPT Courseware 3

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"Household Circuit" Daily Electricity PPT Courseware 3

Household line: Provides users with a power source, provided by the outdoor low-voltage power grid, with a voltage of 220V.

There are ______ wires that are introduced indoors from the outdoor low-voltage power grid. One of them is connected to the ground outdoors, and we call it the _____ wire; the other is called the terminal wire, commonly known as the _____ wire.

1. Composition of household circuits

The sockets can be connected to household appliances such as TVs, refrigerators, and washing machines.

1. Meter

(1) Function: Measure the amount of electrical energy consumed by electrical appliances.

(2) Installation: Install on the main road, before the main switch.

(3) Reading: 123.4 kw·h

2. main switch

Connected in series in the main circuit, it controls the on and off of all circuits in the room.

3. safety device

① Function: When the current in the circuit is too large, the fuse blows and automatically cuts off the circuit to protect it.

② Material: Made of lead-antimony alloy with high resistivity and low melting point.

③ Note: Choose a fuse of appropriate specifications. Do not use copper wire or iron wire instead.

think about it

What are the roles of air switches and leakage protectors in the circuit? What are the benefits of this installation?

Class summary

1. Home circuits are composed of household wiring, energy meters, main switches, fuses, electrical appliances, wires, etc. Understand the functions of each part.

2. Use a test pen to identify the live and neutral wires, and learn about the use of three-wire plugs and the role of leakage protectors.

Give it a try, have you learned it?

1. Please use strokes to represent wires and connect them to the circuit.

2. Regarding household circuits, which of the following statements is incorrect ( )

A. The electric energy meter is used to display the electric energy used by users and should be installed on the main road.

B. The fuse is installed behind the main switch. It will blow when a large current passes through the circuit.

C. Switch and electrical appliances connected in parallel

D. The main switch must not be installed upside down. Its static contact should be on top.

3. When Xiaoqiang was learning to install lighting circuits, due to irregular operation, the two terminals in the switch were connected together. The consequences were ( )

A. The lamp cannot shine normally

B. The fuse blows quickly

C. The switch still works

D. The light is always on

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For more information about the PPT courseware "Household Circuits and Daily Electricity", please click on the "Household Circuits ppt and Daily Electricity ppt" tab.

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Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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