"Household Circuit" Daily Electricity PPT Courseware 2

Description

"Household Circuit" Daily Electricity PPT Courseware 2

learning target

1. What parts does a home circuit consist of and the function of each part can be explained clearly.

2. How to distinguish live wire and neutral wire? Understand the use of three-wire plugs and the role of leakage protectors.

1. Composition of household circuits

It consists of household wiring, electric energy meter, main switch, insurance device, electrical appliances, wires, etc.

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.

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.

think:

1. What material do you think fuses are generally made of?

2. What will happen if the rated current value of the selected fuse is too large or too small?

b. Fuse material:

It is generally made of lead-antimony metal alloy with higher resistivity and lower melting point.

c. Fuse selection:

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

Thinking: Xiao Ming has a new air conditioner installed at home. The fuse always blows when he uses it. Considering the line load, there is no problem, so he simply replaces the fuse with a copper wire. Do you think Xiao Ming’s approach is advisable and why?

Never use copper or iron wire as a substitute for a fuse

3. safety device

Nowadays, the fuses in the circuits of newly built residential buildings generally use air switches. The air switch is installed behind the electric energy meter. When the current in the circuit is too large, the air switch automatically opens and cuts off the circuit, commonly known as tripping.

2. Live and neutral lines

1. Test pen

(1) Function: Distinguish the live line and neutral line.

(2) Structure: spring, neon tube, resistor, pen tail metal body, pen tip metal body

(3) How to use: Touch the metal body at the end of the pen with your hand, and the metal body at the tip of the pen to touch the circuit under test. If the neon tube emits light, it is touching the live wire, otherwise it is the neutral wire.

2. Connection of electrical appliances to neutral and live wires

(1) All electrical appliances (sockets) are connected in parallel in the circuit.

(2) The switch that controls the electrical appliance must be connected between the live wire and the electrical appliance.

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.

I found it:

1. Connect sockets and electrical appliances in parallel

2. Parallel connection between electrical appliances

3. The electrical appliance and the switch that controls it are connected in series, and for safety reasons, the live wire is connected to the switch first and then to the electrical appliance.

4. Sockets are divided into double holes and three holes.

Keywords: daily electricity use teaching courseware, home circuit teaching courseware, New People's Education Edition ninth grade physics PPT courseware, ninth grade physics slide courseware download, daily electricity use PPT courseware download, home circuit PPT courseware download, .ppt Format

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: 2024-11-23

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

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