"Household Circuit" Daily Electricity PPT

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"Household Circuit" Daily Electricity PPT

Part One Content: Basic Knowledge Key Points

Knowledge point 1: Composition of household circuits

1. The figure shows the composition of a home circuit. The electrical appliances connected to ① and ② are connected in parallel, and ② and ③ are connected in series.

2. In household circuits, the correct connection sequence from the entrance line is (C)

A. Knife switch, energy meter, fuse box, socket

B. Knife switch, energy meter, socket, fuse box

C. Electric energy meter, knife switch, fuse box, socket

D. Electric energy meter, fuse box, knife switch, socket

3. In household circuits, the main function of the air switch is (D)

A. Ensure that the voltage of the circuit remains unchanged

B. Ensure that the current of the circuit remains unchanged

C. Ensure that the power of electrical appliances remains unchanged

D. Automatically cut off the circuit when the current in the circuit is too large

Knowledge point 2: live wire and neutral wire

4. The figure shows two situations of practicing using the test pen. The method shown in Figure A is correct. If the socket in the circuit is intact and the wiring is correct, use the test pen in the correct way and insert the tip of the pen into the right jack of the socket, and the neon tube will glow.

5. The structure of a test pen is shown in the figure. Which of the following statements is correct (D)

A. When using the test pen, your hand can touch the pen tip

B. A test pen can determine whether an object is positively or negatively charged

C. The resistor in the test pen can be replaced by iron wire

D. When the neon tube emits light, a weak current passes through the human body

Knowledge point 3: Three-wire plug and leakage protector

6. The hole in the three-hole socket that has more holes than the two-hole socket is connected to the ground wire; electric kettles with metal shells use three-pin plugs to connect the metal shell to the earth during use.

7. A leakage protector is installed on the entry switch of Xiaohong’s home circuit. The relevant data is as follows. The following statement is correct (A)

20A　220V

Rated leakage current 30 mA

Rated non-leakage current 15 mA

Leakage breaking time is less than 0.1 s

A. If the leakage current is greater than 30 mA, the protector will cut off the power supply within 0.1 s.

B. The protector will only work when the leakage duration exceeds 0.1 s.

C. When the leakage current reaches 15 mA, the protector can provide reliable protection.

D. The protector can only protect when the input voltage is greater than 220 V or the power current is greater than 20 A.

Home circuit PPT, part 2: improvement of comprehensive capabilities

9. As shown in the figure is the partial circuit diagram of the current general residential indoor power distribution system. From a safety perspective, the leakage protector should be installed at the position numbered ②, and the air switch should be installed at the position numbered ①.

10. Carefully observe the plugs used in rice cookers, washing machines, etc. at home. We will find that one plug E is longer, as shown in the picture. Then, the longer plug E is connected to the ground wire (optional "live wire", "neutral wire" or "ground wire"); do you think the main purpose of making this plug longer is to connect the ground wire first (or Then disconnect the ground wire or ensure electrical safety).

11. Xiao Ming wants to install a lighting lamp at home. As shown in the picture is the circuit he designed. The dotted boxes 1 and 2 in the figure should be connected to switches and lights, then the switch should be installed in the dotted box 2. After the installation is completed, close the switch and the light does not light up. When using a test pen to test points a, b, and c respectively, if the neon tubes of the test pen all glow, then the fault in the circuit is that the entry neutral line is open.

12. Regarding household circuits, which of the following statements is correct (B)

A. The main switch should be installed behind the fuse

B. The main switch is used to cut off the circuit when inspecting the circuit and replacing components.

C. In a household circuit, several glowing lights are connected in series

D. When the switch controlling electrical appliances is short-circuited, it may cause the air switch to trip.

13. As shown in the figure, when inserting the plug of the power strip into the three-hole socket in the household circuit, which of the following statements is correct (A)

A. The voltage between jacks L and N of the power strip is 220 V

B. Connect jack E of the power strip to the neutral line

C. The switches and indicator lights on the power strip are connected in parallel

D. The power strip cannot provide voltage when the indicator light is not on.

14. As shown in the figure is a schematic diagram of a home circuit, which of the following statements is correct (D)

A. The unit of electric energy expression is kilowatts

B. Wire a directly connected to switch S is the neutral line

C. If a light bulb L1 is connected between wires a and b, then L1 and L are connected in series

D. If point c is disconnected and the plug of the washing machine is inserted into the socket, the washing machine will work but there is a safety hazard.

Household circuit PPT, the third part: expansion, exploration and breakthrough

17. Xiaogang’s father installed a “220 V | 100 W” ceiling light and a “220 V | 5 W” wall light in the room he built. He planned to connect the two lamps in parallel and use an ordinary pull switch to control them. But after completing the connection, I turned on the switch and found that the wall light was on but the ceiling light was not on. He pulled the switch S, and the light that was not on turned on, but the light that was on turned off. When he pulled the switch S again, it returned to its original state. Try to draw a diagram of the circuit he connected incorrectly.

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For more information about the PPT courseware of "Daily Electricity Household Circuits", please click the "Daily Electricity ppt Household Circuits ppt" tab.

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Update Time: 2024-11-22

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