The exact formula for calculating the uncertainty of an electron goes: If you look at an electron, light (photons) hit the electron, thus moving it in a different direction and speed.
When you want to locate your phone across a room, you look at it and light bounces off of your phone to your eye. The reason for this is because an electron is such a tiny tiny amount of mass, the act of observing it with any kind of light (radiation) would move the particle in a different direction/velocity. He stated that an electron's velocity and location can not possible be known simultaneously. Heisenberg contributed through his uncertainty principal.
