"Home Circuit" Home Circuit and Safe Electricity PPT Courseware 2

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"Home Circuit" Home Circuit and Safe Electricity PPT Courseware 2

Home circuit composition

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.

fuse

1. Production material: Made of lead-antimony alloy with high resistivity and low melting point.

2. Principle: Thermal effect of electric current.

3. Function: When the current is too large, it will fuse due to the temperature rise, cut off the circuit, and play the role of protecting the circuit.

4. Specifications: The specifications of the fuse are expressed in terms of rated current. When selecting, the rated current of the fuse should be equal to or slightly greater than the maximum normal operating current in the circuit.

5. The fuse must be selected appropriately. The fuse cannot be too thick, and copper wire or iron wire cannot be used instead of the fuse. Otherwise, when the current is too large, the fuse cannot be blown in time and cannot protect the circuit.

6. The fuse should be connected in series with the circuit it protects.

How to use the test pen

Touch the tail of the metal pen with your hand, and the tip of the metal pen touches the wire.

1. Your hand does not touch the metal body at the end of the pen. Even if the metal body at the pen tip touches the live line, the neon tube will not emit light.

2. When using, your hands must not touch the metal body of the pen tip.

How to connect electric lights and switches

The switch that controls the light should be connected in series with the light and connected to the live wire

1. 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.

2. 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

3. The following four statements are in line with the safe use of electricity ( )

A. Release the live and neutral wires with both hands at the same time

B. The socket is installed too low, and children put their little fingers into the socket when playing.

C. Add grounding protection to the housing of household appliances

D. Someone playing with an electrical appliance touches the metal plug connected to the live wire.

E. Use wet hands to pull out the live plug of an electrical appliance.

F. Drying clothes on the wire

G. Connect the switch to the neutral line

H. Temporary replacement of the fuse can be replaced by copper wire

I. Use a three-hole socket to power the refrigerator.

J. Wipe the working TV with a damp cloth

K. Flying a kite under high-voltage lines

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For more information about the PPT courseware "Household Circuits, Home Circuits and Safe Use of Electricity", please click on the "Household Circuits PPT" Home Circuits and Safe Use of Electricity PPT tab.

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Update Time: 2024-09-07

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