"Home Circuit" Home Circuit and Safe Electricity PPT Courseware

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"Home Circuit" Home Circuit and Safe Electricity PPT Courseware

1. Understand household circuits

Note: Clicking the green button is for step-by-step connection lines; clicking the red button is regressing; clicking the yellow button is switching the air switch and knife switch; clicking the blue button is the circuit diagram.

The main components and functions of home circuits:

Low voltage power supply line Power supply for household circuits

Electric energy meter An instrument that measures the electrical energy consumed by household circuits

Knife switch controls the on and off of household circuits for easy maintenance and installation.

Fuse: When the circuit current is too large, it will automatically blow to protect the circuit.

Lamps and switches. Lamps are used for lighting. Switches control the lights.

Socket to power household appliances

Component connections

The light and switch are connected in series, and the switch is connected to the live wire

Electric lamps are connected in parallel between live and neutral wires

The light and socket are connected in parallel between the live and neutral wires

The sockets are connected in parallel between the live wire and the neutral wire

2. Live and neutral lines

1. Entrance wire: the wire connecting the outdoor power supply circuit

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.

(Ground wire: usually connected to the ground conductor buried in the earth in a residential building)

2. Test pen

(1) Structure and use of electric test pen

(2) Working principle of electric test pen

(3) Communication and discussion:

①Why should a high resistor be connected in series with the electric test pen?

Answer: Only when a high resistance is connected in series, the current passing through the human body will be very small, and the human body is safe.

②Why does the neon tube not light up when measuring the zero line with a test pen?

Answer: The voltage between the neutral line and the ground is 0V. At this time, no current is generated, which of course will not cause the neon tube to glow.

③When using a voltage test pen, why can’t you touch the metal body of the pen tip with your hand?

Answer: When you touch the metal body of the pen tip with your hand, there will be a voltage of 220V at both ends of the human body. The strong current generated will flow through the human body, causing a safety accident.

Trial test

1. Among the two methods of using the electric test pen shown in the figure A and B, the correct one is ___.

2. The function of fuses in household circuits is ( )

A. Prevent electric shock B. Stabilize voltage

C.Measure electric energy D.Protect circuit

3. A certain class of students installed four lights after learning about household circuits. Which one do you think is correct ( )

Experience and gain

What did you learn?

What do you realize most deeply?

What did you think of?

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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: 2024-11-22

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 2 industry PPT template

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