A proton is released from rest in a uniform electric field. As it moves, its:

Core Concept

A proton has positive charge, so when released from rest in a uniform electric field, it will accelerate in the direction of the field. As it accelerates, its kinetic energy increases. Since electric potential energy U = qV, and the proton is moving to a region of lower electric potential (in the direction of the field), its electric potential energy decreases. The conservation of energy requires that the increase in kinetic energy equals the decrease in electric potential energy.