相关知识点: 试题来源: 解析 PF=cosθ=(U dot I)/|UI|=cos[arg(ū/ī)]where 'dot' means dot product of two vectors,and ū and ī are the equivalent complex value of voltage and current,respectively,and θ is the angle between th......
Miriam has taught middle- and high-school math for over 10 years and has a master's degree in Curriculum and Instruction. View bio Learn to define and factor a perfect cube. Learn to factor the sum and difference of perfect cubes. Discover the perfect cube formula. See perfect cube ex...
电力公式(Powerformula)KnownPe=148KW,Kx=0.8,Cos,phi,=0.8,thecurrentII=148000/0.64/380/1.732=350A(setoperatingvoltage380V)Optional3**951851cable,ifthelongdistanceconditionofoptionalcable*120*32401insurance1andPe=276Kw,ratedload276Kw,thatis,themaximumloadis276Kw.2andCOS=0.9,thepowerfactoris0.93andlj...
内容提示: 电力公式(Power formula) Known Pe=148KW, Kx=0.8, Cos, phi, =0.8, the current I I=148000/0.64/380/1.732=350A (set operating voltage 380V) Optional 3 * * 95 1851 cable, if the long distance condition of optional cable * 120 * 3 2401 insurance 1 and Pe=276Kw, rated ...
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Power factorPF= cosφ=R/(R2 + X2)1/2,φ= power factor angle. For the purely resistive circuit,PF= 1 (perfect). The apparent powerSis calculated according to Pythagoras, the active powerPand reactive powerQ.S= √(P2+Q2) Electrical Measurement Definitions ...
(57) [Abstract] The present invention relates to dimmable compact fluorescent lamp more triac with a low power factor. Also in the low dimming levels, the power feedback circuit coupled between the input and output stages of the lamp ballast, causing sufficient current required to maintain ...
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The formula for the binomial theorem states that (x+y) raised to any power n is equal to the summation from k=0 to n of "n choose k" times x to the (n-k) power times y to the k power. This summation is given where x and y are the two terms of the binomial, n is the ...