The right hand rule #1 can be used to help us predict the direction of a magnetic field generated by the current by realizing that the current can produce a magnetic field. Currents are moving charges that flow through loops which makes it magnetic. The right hand rule #1 works by pointing your thumb with the direction of the current and finger curls in the direction of the magnetic field. Depending on which direction your thumb goes will tell you which way the current is going. The direction that your finger curls will either tell you that the magnetic field is going into or out. Using the right hand rule #1 can be an efficient way to finding the direction of the magnetic field.