- Q3 Paschen S Law Is An Equation That Gives The Breakdown Voltage Ub That Is The Voltage Necessary To Start A Dischar 1 (94.38 KiB) Viewed 23 times
Q3. Paschen's Law is an equation that gives the breakdown voltage (Ub), that is the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap distance (pd). The Paschen's curve of a specific gas is shown in figure and the equation is as below: y 400 x y = f(x) = In(15x) - In(9.21) y = f(x) in which y=U. (in Volt) and x=p.d (in Torr.cm). a) Find a function for the first ionization coefficient of this gas according to gas pressure and electric field. b) Find the second ionization coefficient of this gas. c) Find the minimum value of y.