The fundamental law expressing the relations between current,
electro-motive force and resistance in an active electric circuit. It
may be expressed thus:

(a) The current strength is equal to the electro-motive force divided by
the resistance.

(b) The electro-motive force is equal to the current strength multiplied
by the resistance.

(c) The resistance is equal to the electro-motive force divided by the
current strength. All these are different forms of the same statement.
Algebraically the law is usually expressed thus, (a) C = E/R. It may
also be expressed thus: (b) E = C*R and (c) R= E/C, in which R denotes
resistance, C denotes current strength, and E denotes electro-motive
force.