SI unit of an electric field is volts per meter (V/m)
The SI unit of the electric field is the newton per coulomb (N/C) or volt per meter (V/m). In terms of the SI base units, it is kg⋅m⋅s−3⋅A−1. These are derived units where Newton is a unit of force and Coulomb is the unit of charge.
An electric field is defined as a vector field that can be associated with each point in space, the force per unit charge exerted on a positive test charge at rest at that point.
The SI unit of the electric field has two equivalent forms:
Newtons per coulomb (N/C): This relates the electric field to the force it exerts on a charged object. Here, Newton (N) is the unit of force and Coulomb (C) is the unit of electric charge.
Volts per meter (V/m): This expresses the electric field in terms of the electrical potential difference (voltage) per unit distance.