Question

Which of the following is the correct Ohm's law formula?

Answer 1

We know that
The Ohm's law formula states that
The resistor's current I in amps (A) is equal to the resistor's voltage V in volts (V) divided by the resistance R in ohms (Ω):
so
I=V/R
In some cases, Ohm's law uses the letter E to represent voltage. E denotes electromotive force
I=E/R

therefore

the answer is the option 
C.) I = E/R