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"Exercise in this Chapter" Life Electricity PPT
1. (Shiyan High School Entrance Examination) In household circuits, electrical appliances are connected in parallel (optional "series" or "parallel"). On Sunday, Xiaotian was checking the Internet with the air conditioner on at home. When her mother plugged the electric kettle into the socket while cooking, the air switch immediately "tripped". Xiaotian analyzed that the reason may be an internal short circuit in the electric kettle plug, or it may be The total power of electrical appliances in the home circuit is too high.
2. (Panzhihua High School Entrance Examination) As shown in the figure, the correct way to use the electric test pen is B (optional "A" or "B"). It is known that the resistance of the electric test pen is about 1.1×106 Ω, and the resistance of the neon tube and the human body It is much smaller than it and can be ignored. Please calculate that the current of the "220 40 W" light bulb when it is working normally is about 900 times the current passing through the human body when the voltage test pen is used correctly (the result is rounded to an integer).
3. (Changsha High School Entrance Examination) "Use electricity safely and cherish life" is the awareness that every citizen should have. Which of the following statements about home circuits is correct (C)
A. When a fire breaks out in a household circuit, you should first put it out with water and then disconnect the circuit.
B. If the air switch trips, it must be caused by a short circuit in the household circuit.
C. When someone gets an electric shock, the leakage protector will quickly cut off the circuit.
D. Multiple high-power electrical appliances in the home should be connected to the same power strip for use.
4. (Mianyang High School Entrance Examination) As shown in the picture, A is standing on a dry wooden table with one hand touching the live wire; B is standing on the ground with one hand touching the zero line; C is standing on a dry wooden table with one hand touching the To the line of fire. At this time, Ding stood on the ground and pulled Bing with his hands. Then (D)
A.Both A and B will get electric shock
B.Both A and C will get electric shock
C. Both B and D will get electric shock.
D. Both C and D will get electric shock.
5. (Ningbo High School Entrance Examination) The picture shown is part of a normal household circuit. Which of the following statements is correct (C)
A. The voltage between wire B and ground is 220 V
B. The test pen is inserted into the left and right jacks of the socket one after another, and the neon tubes both glow.
C. Inserting the plug of the refrigerator into the three-hole socket can ground the metal shell of the refrigerator.
D. After turning off the switch S, a person standing on the ground will not get an electric shock if he touches point a or point b.
6. (Meishan High School Entrance Examination) The projector bulb is very powerful, so it requires a fan to dissipate heat. After use, you should first turn off the bulb L, and then turn off the fan M; please use strokes to represent the wires in the picture to complete the circuit connection. The requirements are: first When switch S1 is turned off, the bulb goes out and the fan continues to rotate. When switch S2 is turned off again, the fan stops rotating. If only switch S1 is closed, the bulb does not light up.
7. (Shanxi High School Entrance Examination) Xiao Ming encountered this situation when he was studying at home: As soon as he inserted the plug of the desk lamp into the socket, he heard a "pop" and all the electrical appliances in the house stopped working. It was checked that the fuse was blown. Please use your knowledge of physics to explain why the fuse blew.
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"Unit Error-prone Reinforcement Training" Life Electricity PPT:
"Unit Error-prone Strengthening Training" Daily Electricity PPT Common Error Point 1: Unclear judgment of household circuit faults 1. In the household circuit as shown in the picture, the voltage between the live wire and the neutral wire should be 220 V. When the switch S is closed, the bulb L does not light up. Use a test pen to test the neon tubes at points a, b, and c respectively.
"Safe Electricity Use" PPT download of daily electricity use:
"Safe Electricity Use" PPT download of daily electricity use Part 1: Knowledge Management 1. Electric shock The danger of electric current to the human body: depends on the magnitude of the voltage..
"Safe Electricity Use" PPT for daily electricity use:
"Safe Use of Electricity" Life Electricity PPT Part One Content: Basic Knowledge Points Knowledge Point 1 The higher the voltage, the more dangerous it is. 1. Experience has proven that only voltages no higher than 36 V are safe. The higher the voltage, the more dangerous it is. Ohm's law tells us that the size of the current in a conductor is related to...