E is energy in Joules (J) or Electron Volts (eV).
h is Planck's Constant. When using joules, Planck's constant is 6.63*10^-34 Joule*seconds (J*s). When using electron volts, Planck's constant is 4.14*10^-15 electron volt*seconds (eV*s).
f is the frequency of light in inverse seconds or 1/second
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w = hf - E
The 'c' in that equation stands for the speed of light in a vacuum. If the equation is being evaluated in metric units, then it's 299,792,458 meters per second. If in English units, then it's 186,282 miles per second.
Albert Einstein.Except that the equation was e = mc2
Albert Einstein
The formula for energy. E is for energy(Units = Joules) P is for power(Units = Watts) T is for time(Units = Seconds)