"Household Circuits" Safe Electricity PPT Courseware 2

Description

"Household Circuits" Safe Electricity PPT Courseware 2

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.

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:

(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.

3. Master switch

【effect】

Cut off the power supply when troubleshooting circuit faults to avoid electric shock.

【structure】

moving contact static contact

【Install】

Be still, move

【think】

①Why should it be installed like this?

The knife is pushed upward, and the passage

Pull the blade downward to break the circuit

4. Fuse

1. Function: When the current is too large, it will automatically fuse and cut off the circuit to protect the circuit.

2. Production material: Made of lead antimony with high resistance and low melting point

3. Analysis formula: Q=I²RT

4. Do not use copper wire or iron wire instead of fuse

5. Now we use an air switch with a fuse instead of a fuse. When the air switch cuts off the circuit, we must first find the cause of the fault and then restore the power supply after eliminating it.

Class summary

1. Home circuits are composed of entrance lines, 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.

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

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Update Time: 2024-10-27

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

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