That is two feet.
Ruler 2 feet by o? Two styles get two feet, then one? The two types of analysis can be seen from the above analysis, when the switch is disconnected, the sliding varistor is connected to the circuit, and the ratio of the electrical power of the series, so the ratio of the resistance to the resistance of the two resistors.
That is to say, the combination of the corpse and the corpse of the corpse is decomposed. The above analysis shows that when answering the problem of electric power, you can't move the dogma. According to the certain Chen style problem, you should apply it flexibly according to the known conditions in the question. The characteristics of different circuits, the full application of known conditions and the results of the known conditions, clever use of mathematical knowledge, the problem will be solved.
(Received date, one cow, one gentleman, the grip, the singer, the singer, the singer, the singer, the singer, the singer, the singer
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The door, the inner song wide, the second factory one to play the black dragon, the fortunately, the Tianchong splashed the blame, the arrogant, the arrogant, the price, the singer, the singer, the singer, the singer, the singer, the fan, the singer, the singer, the singer, the singer The compressor consumes power when it is working.
A single such refrigerator is connected to the electric energy meter marked with the word wh', and the dial of the continuous working electric energy meter of the refrigerator compressor is measured. (1) The power of the refrigerator compressor is measured. The refrigerator consumes electricity for one day, and the compressor is used for each continuous working time and the interval time after each work is also equal. Then, the possible value of the intermittent time is the power of the refrigerator compressor. Keep the same, the calculation results are retained to the whole number) (Beijing Haidian District Middle School Question) The author believes that this is a good question that originates from books and is closely related to life.
The analysis is as follows.
The first electric energy meter to measure the power consumption of household appliances is the small experiment after the ninth chapter of the second volume of the junior high school physics, so this question is from the book.
Secondly, it can be seen from the propositional intent of this question that the propositioner pays attention to the experiment, strengthens the experimental teaching of physics teaching in junior high school, attaches importance to the experiment, pays attention to the small experiment closely related to life, and examines the students' practical ability.
It truly reflects the new curriculum concept from life to physics and from physics to society.
The third question focuses on the ability of students to connect theory with reality.
Candidates who want to solve this problem, do not contact life, do not pay attention to observation, it is impossible to do.
After testing, it was found that most candidates had the following solutions to the second question.
The power consumption of the continuous compressor of the refrigerator compressor is only two times within two hours. The total time of the refrigerator is only once in a single time, and the interval time is analyzed by the examiner. The refrigerator starts once, intermittently, and ignores the problem of whether the first start is intermittent or intermittent.
If it is intermittent at the beginning, it will start once, and the interval will be up to 3 times. If the first time is started, the number of intermittent times is at least 31 times, so the correct solution is the minimum number of times the refrigerator is stopped, at most 3 times.
Therefore, the longest intermittent time of the compressor can be so that the compressor has the shortest intermittent time two, so the intermittent time of the compressor is between.
One year, the secondary school physics can only solve the problem accurately by closely connecting with life, observing life and paying attention to the physics around us. Therefore, in teaching, we should pay more attention to quality education and cultivate students' learning ability.
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Order one or two. ,people,. Has been a Sheng. A straight has been linked to the real theory of the real problem in Gansu Huining County Chaimen Middle School (Hong.
Xi (2) The annual power generation is only (3) In order to ensure the normal operation of the energy storage power station, sufficient water source is necessary, and the water pumped to the reservoir cannot be lost. Therefore, the answer is 1 good geological conditions, upper reservoir No water leakage.
The abundant rainfall in the area makes the supply of water in the lower reservoir reliable.
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Door, Note Day IJ pouring factory 竺, one, one 竺, one 竺 one, the deep analysis of the characteristics of the pulley. Jiangxi Dayu County Jingzhou Middle School 1) Liao Shanwu 匕 2222 junior high school physics textbook, the characteristics of the pulley It is mainly the perceptual conclusion drawn from the experiment that the use of fixed pulleys can not save labor. The use of moving pulleys can save half of the effort and not analyze them deeply, which will result in the conclusion of the students' mechanical use, but not flexible.
In fact, the use of moving pulleys may also be laborious. Fixed pulleys and moving pulleys are only different specific application forms of pulleys, but they have some common essential features.
Now the analysis of this problem is as follows. First of all, it should be clear that the same rope is wound on both sides of the pulley, so the tension of the rope is the same everywhere (the corpse in the picture and the pulley rotates at a constant speed, so it is affected by the balance force.
When the weight of the smashing surface is not considered, the above three figures (the tension of the ropes on both sides of the pulley are equal to twenty (balanced force) energy storage power station is designed for the reasonable use of electricity by the power grid to improve the economic benefits of electricity.
Its working principle is that the excess electric energy is pumped through the water pump to pump the water from the lower reservoir to the upper reservoir in the middle of the night, and the water is discharged through the gate during the day to supplement the electric energy.
The Tianhuangping Pumped Storage Power Station in our province is the purest pumped storage power station project with the highest production capacity and the highest head drop in China. When the upper reservoir can store water, the average head (fall) of the upper and lower reservoirs when releasing water is assumed to be the upper reservoir at night. All water storage, all discharged during the day, the efficiency of power generation is) How many degrees of power can be generated per day (how many years can be generated for the country after the completion of the project) (3) Know the working principle of the storage power station, to make the power station normal throughout the year Power generation, what do you think is the two important natural conditions that the power station site must meet? This is a typical theoretical and practical test.
The energy storage power station is a new type of power station for regulating the balance of the power grid. The entrance examination paper reflects the strong atmosphere of the times.
This topic deals with many physical concepts such as density mass gravity power efficiency and the transformation and conservation of energy. It also involves knowledge of geography and nature, and it is indeed examining the comprehensive ability of students.
The solution of the water stored in the reservoir every day is completely converted into gravity and the function is converted into electric energy. The value of the water is 户 å… ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™ ç•™
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