text: #Electric potential energy, the easy way to solve physics problems.
  #This energy is converted from potential to kinetic just like in any other situation.
  #The calculations based upon Energy in general can be used to design and build anything.
  #This application will attempt to quickly formulate Energy quantities and interpret them,
  # calculate electric potential or voltage and electric field strength, which is - the derivative of Voltage.
  
  #Quantities that would be nice not to have to type out every time:
  #Charge of an electron
  ech = -1.6e-19
  #Charge of a proton
  pch = 1.6e-19
  #Mass of an electron
  m_elec = 9.11e-31
  #Mass of a proton
  m_prot = 1.67e-27
  
  #First there are several variable quantities needed.
  
  #import math functions
  import math
  
  #Permittivity constant 'epsilon naught using alt 238'
  ε = 8.854187817e-12
  
  #Store the value of π for ease of use later 'alt 227' for PC 'option P' for mac
  π = math.pi
  
  #Electric constant ¼πε
  k = 1/(4*π*ε)
  
  #Define formulas for use
  #Usube will be used for the Electric Potential Energy formula
  #▲K = -▲Usube 'delta = alt 30'
  
  #Formula for change in potential energy
  #****▲U = k*(Qsource * qtest/rf - Qsource * qtest/ri)****
  
  #Later we shall add a function that incorporates the use of this formula while taking inputs from the user.
  #We first need a way to determine whether we want to calculate a potential energy
  # value alone, that can be used later, rather than a change in potential energy.
  