Quantity of electric chargechargeHow many.Generally speaking, the quantity of charge is called electric quantity, which is expressed by the symbol Q, and the unit is coulomb (the symbol is C),CoulombIt's a big unit.In order to find the relationship between electricity and quantity of electricity, Coulomb used an ingenious (but not strict) method.[4]From the consideration of symmetry, he concluded that a charged metal ball should be separated after contacting another uncharged metal ball with the same radius and material, and the electric quantity of each ball should be half of the electric quantity of the original charged ball.[4]
The strict definition of electricity is that later scientists (especiallyGaussian）Their definition is as follows: there are three point charges A, B and C, the distance between shilling A and C is r, and their electric power is F measured by the torsion balanceAC, then make B and C have the same distance, and measure their power FBC。[4]The power of any specified A is 1 unit, q=FBC/FACThis is the definition of electricity.[4]
English: Quantity of electric charge;Electrical voltage;Electrical amperage。The strict definition of electric quantity was made by later scientists (especially Gauss). Their definition is as follows. There are three point charges, A, B and C. The distance between shilling A and C is r, and their electric quantity is F measured by a torsion balanceAC, then make B and C have the same distance, and measure their power FBC, write down the ratio F of these two forcesAC/FBC。[4]Repeat the above experiment with other point charges D, E... instead of C. It is found that FAC/FBC=FAD/FBD=FAF/FBF=…[4]
It can be seen that this ratio only depends on the point charges A and B and has nothing to do with the third point charge. It is found that the above formula is still true by changing the distance r and repeating the above experiment.[4]Visible FAC/FBCIt reflects the charged property of A and B.[4]The power of any specified A is 1 unit, q=FBC/FACThis is the definition of electricity.[4]
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Power Diagram
Electric quantity of one electron e=1.60 * 10-19Library.Experiments indicate that the amount charged by any charged particle is either equal to that of electrons orproton, or an integral multiple of their power, so take 1.60 * 10-19The library is calledElementary charge。
Electric quantity can also refer to the demand of electric equipmentelectric energyQuantity, which is also called electric energy orElectric power。The unit of electric energy isKW · h(kW·h)。W=P * t (W represents electric energy;P represents active power, in kW;T is the time in hours (h).The power here is also divided intoActive electricityQuantity andReactive power。The unit of reactive power is kilovar · h (kVar · h).
Current intensityMicro expression of: I=nqsv, q=I/nsv, where I is the current intensity, n is the number of charges per unit volume, and s is the conductor'sCross sectional areaV is the velocity of the charge.
Reactive power
1、 High voltage altimeter user:
Forward reactive power+| Reverse reactive power|
Including:
Positive reactive power=(current month's table character - last month's table character) * multiplying factor
Reverse reactive power=(current month's table character - last month's table character) * multiplying factor
That is to say, the sum of the absolute value of the difference between the positive and negative reactive energy and (reactive copper loss+reactive iron loss).
Electricity consumption statistics
Power grid image
State Grid announced that the temperature in most parts of China in the summer of 2013 was higher than usual, and the power demand of the whole society would increase significantly. The power supply and demand situation in the company's business areas was generally balanced, but the surplus and deficit were unevenly distributed[2]。
From a regional perspective, it is expected that the "Sanhua" power grid will be basically balanced;The surplus power of Northeast and Northwest power grids is about 17 million kilowatts and 14 million kilowatts respectively;The Beijing Tianjin Hebei and Zhejiang power grids are in tight balance.
State Grid also said that in the next three years of the "12th Five Year Plan", all the people without electricity in the company's business area will be electrified.To this end, the State Grid will solve the power supply problem of 429000 households and 1.756 million people through the extension of the power grid, and the local government will adopt new energy decentralized power supply to solve the power supply problem of 169000 households and 771000 people.
The in-depth evaluation of China's power industry[3]The report shows that since 2006, the State Grid has invested 19.89 billion yuan, which has solved the problem of power supply for 1.491 million households and 5.719 million people without electricity.Among them, from 2011 to 2012, the company invested 4.37 billion yuan to solve the power supply problem of 146000 households and 619800 people through grid extension.By the end of 2012, there were 597000 households without electricity and 2.527 million people without electricity in the operation area of the State Grid.
