"Home Circuit" PPT

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"Home Circuit" PPT

Part One: Composition and Connection Methods of Home Circuits

question:

①What parts does a home circuit consist of?

Household wires, energy meters, circuit breakers, sockets, lamp holders, switches.

②How are the sockets and lights connected? What are the benefits of such a connection?

When connected in parallel, each electrical appliance will not affect each other when working.

Home circuit PPT, part 2 content: several main parts of home circuit

1. House entrance line

(1) One wire is called __ and the other wire is __. The voltage between the two wires is __ volts.

(2) Use __________ to identify the live and neutral lines.

(3) Use of test pen

The hand touches the metal body of the pen tail, and the metal body of the pen tip touches the object being measured.

2. Electric energy meter

Excessive current can cause accidents. What measures should be taken to prevent accidents?

Install protective devices - fuses or circuit breakers - in the circuit.

3. Fuse

Open plug-in fuse

Closed tube fuse

(1) There are two types of fuses: __________ fuses and __________ fuses

(2) The fuse is equipped with __________

a. Function of fuse:

When the current in the circuit is too large, the fuse will automatically blow.

b. Fuse material:

Generally made of metal alloys with relatively low melting points.

c. Fuse selection:

The current of the fuse is equal to or slightly greater than the normal operating current in the circuit.

Household circuit PPT, part three: summary

What did you learn today?

1. Composition of household circuits

Household wires, energy meters, circuit breakers, sockets, lamp holders, switches.

2. The entrance wire is divided into live wire and neutral wire, and the voltage between them is 220 volts.

3. Use a test pen to identify the live and neutral wires.

4. The function, materials and selection of fuses.

Home circuit PPT, Part 4: Consolidation exercises

1. Xiaoxin bought a circuit breaker, energy meter, and socket at home. The correct connection sequence in the circuit is ＿＿＿, ＿＿＿, ＿＿.

2. Xiaoxin’s home has a new air conditioner, but its fuses often blow. Do you think the reason may be ( )

A． The fuse is too thick and does not meet specifications.

B. All electrical appliances work simultaneously

C. It must be caused by a short circuit

D. The total current in the circuit must exceed the fusing current of the fuse. It may be a short circuit or the electrical appliance may be overloaded.

3. The current values ​​of the electrical appliances used in Xiaoxin’s home are as follows: one computer: 0.4A, all lights: 0.8A in total, air conditioner: 1A, refrigerator: 0.5A, TV: 0.2A. Please help him choose the fuse. ( )

A. A fuse with a rated current of 4A

B. A fuse with a rated current of 2.5A

C. A fuse with a rated current of 3A

D. The larger the rated current, the better the fuse

Keywords: Free download of Zhejiang Education Edition science PPT courseware for eighth grade volume 2, home circuit PPT download, .PPT format;

For more information about the "Household Circuit" PPT courseware, please click on the "Household Circuit ppt" tab.

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Update Time: 2024-11-22

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