"Household Circuits" Safe Electricity PPT Courseware

Description

"Household Circuits" Safe Electricity PPT Courseware

1. Composition of household circuits

Problem display

What parts does a home circuit consist of? What is the function of each part?

What is the role of an energy meter in a home circuit?

Are electrical appliances and sockets connected in series or in parallel? Why?

How is the connection between the light bulb and the switch that controls it? What are the benefits of this connection?

What does the nameplate "220V, 10 (20) A" on the electric energy meter mean?

Incoming line: led by outdoor low-voltage transmission lines

Live wire: The voltage between the live wire and the neutral wire is 220V, and the voltage with the ground is also 220V

Neutral line: The voltage with ground is 0V

Electric energy meter: Installed behind the household line, it is used to measure the amount of electrical energy consumed by the home.

2. The function of fuse

The function of the fuse: When the current in the circuit is too large, it automatically blows and cuts off the circuit.

Causes of excessive current in the circuit:

(1) Short circuit (live wire and neutral wire directly collide)

(2) Overload (the total power of electrical appliances is too large)

Fuse selection principles:

The fuse should be selected so that its rated current is equal to or slightly greater than the normal operating current in the circuit.

If the rated current of the fuse is too large, it will not function as insurance;

If the rated current of the fuse is too small, it cannot guarantee that all electrical appliances will work at the same time.

Never use copper wire or iron wire instead of fuse.

Fuse summary:

A. Function: When excessive current passes through, the fuse blows quickly due to overheating, automatically cutting off the circuit and playing a protective role. It is also called a fuse.

B. Material: The fuse should be made of lead-antimony alloy with lower melting point and higher resistance.

C. Specifications: Expressed by rated current, they are 1A, 1.5A, 2A, 3A, 5A, 10A, etc.

D. Selection: The rated current is equal to or slightly larger than the maximum normal operating current.

E. Installation: Install it under the knife switch or in a plug-in fuse, and then connect it in series in the live wire.

practise

1. There are four 60W light bulbs in the circuit, one 120W washing machine, one 80W TV, and one 600W rice cooker. The most suitable electric energy meter in this household circuit is ( )

A220V 3A B220V 5A C220V 10A D380V5A

2. An electric energy meter marked with "220V 10A" can be installed with up to _____ lights of "220V 40w"

3. An electric energy meter marked with 3000r/Kw·h, the dial rotates 45 times, consuming a total of __________J electric energy.

4. A classroom is equipped with 7 "220V 40w" fluorescent lamps. The classroom fuse should be ( )

A A thin copper wire

B A fuse with a rated current of 1.00A

C A fuse with a rated current of 1.25A

D A fuse with a rated current of 1.35A

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Update Time: 2024-11-22

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 1 industry PPT template

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