Detailed description of capacitor formulas and capacitance calculation formulas

General formula C (capacitance) = Q / U parallel plate capacitor special formula: the strength of the electric field between the plates E = U/d, capacitor capacitance decision C = εS/4πkd parallel plate capacitor capacitance, theory and experiments have shown that the capacitance of parallel-plate capacitors with dielectric constant ε C and proportional to the area of the opposite, with the root of the distance between the plates d is proportional to the C = εS/4πkd, in which the k for electrostatic force where k is the electrostatic force and the dielectric constant ε is determined by the medium between the two plates!

　　And this formula in the π is that pi π = 3.141592653589 ......

　　P.S. Calculation formula for capacitance

　　If it's from a textbook the calculation is simple:

　　C = Q / U, Q for the capacitor plates stored charge (K), U for the capacitor voltage (V), C is the capacitance (F)

　　If you are calculating the starting capacitance of a motor, press - Simple Calculation of Capacitance for Single Phase Capacitor Motors:

　　C=I'×10^6/(2πfU')=... ≈10k-P/(88π-cosφ)

　　k Current coefficient, take the value of 0.5~0.7

　　P motor rated power (W), f power frequency (Hz) (50), U rated voltage (V), U' capacitor rated voltage, generally choose 400Vcosφ power factor