The density of this quantity is equal to the time derivative of the D-field. A device that produces a constant amount of this quantity is represented by a diamond with an arrow within it. This quantity is the subject of the skin effect, in which it is preferentially distributed towards the surface of an object due to self-inductance. This quantity, which is measured in an 
The density of this quantity is equal to the time derivative of the D-field. A device that produces a constant amount of this quantity is represented by a diamond with an arrow within it. This quantity is the subject of the skin effect, in which it is preferentially distributed towards the surface of an object due to self-inductance. This quantity, which is measured in an SI base unit, is the subject of Kirchhoff's node rule, which is an alternate statement of charge conservation. The power dissipated by a wire is proportional to the square of the "direct" type of this quantity. For 10 points, name this quantity that is related to resistance and voltage by Ohm's law and is measured in amperes.
The density of this quantity is equal to the time derivative of the D-field.
electric current