#2 Rate Constant, Impedance Concepts & Z of Electrical Elements Explained

[@MrMishra814]

-Low rate const at low voltage; rate const prop to voltage exponentially
-Diffuse > react > go out
-Slow reaction> kinetics controlled
-miexed regime
-Fast reaction > mass transfer/diffusion from boundary layer >Rate limiting step
-Applied potential moves free energy of reactants and products but also transition state, but transition state is not moved up as much
-charge transfer coeff: (0-1) ratio
-boundary layer thickness can be reduced by changing flow rate/ rotating electrode
-impedance: for resistor : current follows voltage, no difference in phase, current doesnt depend on frequency
-for capacitor: current leads potential, 90 deg phase offset; current proportional to frequency for the same E
-in cap i = c dv/dt); c d(e sin wt)/dt = C w e cos wt
-impedance: transfer function, vector ratio, generalized resistance
-for inductor: voltage follows current, 90degree phase offset; current inversly prop to frequency
-in ind E= L dI/dt; E=L d(I sinwt)/dt; E= L w I cos wt
-Impedance is represented as complex number: phase and magnitude represented by same complex number; e^jwt = cos wt + j sin wt
-Zr= R
-Zc= 1/jwC = -j/wC // -j denotes below the real axis
-Zl=jwL
-AC can be superimposed on DC (bias) > will lead to different impedance values because of electrochemical reactions. In normal circuits DC bias has no effect on Impedance
-Measurements always made on differential impedance: dE/di, can be negative if I-V slope is negative (second half of concave down parabola)
-immitance: combination of admitance (1/Z) and Z
-KCL = sum of all I on a node = 0; KVL algebric sum of all voltages in a loop zero
-Calculating Series and parallel immitance: series: add impedance; parallel: add admittance

[@naveenbommireddy381]

sir your explanation is too good. Can u make video lectures on water splitting also