Which expression represents the formula to solve for current in Ohm's law?

• A. I = E * R
• B. I = E / R
• C. I = R / E
• D. I = E - R

Answer: (B)

Ohm's law tells us how current, voltage, and resistance relate: current equals voltage divided by resistance. Since voltage V equals IR, solving for current I gives I = V/R. If the problem uses E to denote voltage, that becomes I = E/R. This matches the units as well: volts divided by ohms yields amperes. The other forms would multiply, divide in the wrong order, or subtract, which isn’t how Ohm’s law links these quantities.