Which of the following Ohm's Law formulas is incorrect?

Which of the following Ohm's Law formulas is incorrect?

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

Answer: (B)

The formula that is correct and follows Ohm's Law is the one that states current (I) is equal to voltage (E) divided by resistance (R), represented as I = E / R. This fundamental relationship indicates how much current will flow through a circuit for a given voltage across and resistance in the circuit. The incorrect formula is the one that states I = R / E, which would suggest that current is determined by dividing resistance by voltage. This interpretation does not align with Ohm's Law, which consistently shows current as a direct function of voltage and an inverse function of resistance. The other two formulas, V = I * R and R = E / I, correctly represent the relationships dictated by Ohm's Law. V = I * R derives voltage as the product of current and resistance, and R = E / I expresses resistance as voltage divided by current, both valid and frequently used in electrical calculations.

The formula that is correct and follows Ohm's Law is the one that states current (I) is equal to voltage (E) divided by resistance (R), represented as I = E / R. This fundamental relationship indicates how much current will flow through a circuit for a given voltage across and resistance in the circuit.

The incorrect formula is the one that states I = R / E, which would suggest that current is determined by dividing resistance by voltage. This interpretation does not align with Ohm's Law, which consistently shows current as a direct function of voltage and an inverse function of resistance.

The other two formulas, V = I * R and R = E / I, correctly represent the relationships dictated by Ohm's Law. V = I * R derives voltage as the product of current and resistance, and R = E / I expresses resistance as voltage divided by current, both valid and frequently used in electrical calculations.