Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it? A. E = PR B. E = I2R C. I = E/R D. I = ER E. None of the above

[amp_mcq option1=”E = PR” option2=”E = I2R” option3=”I = E/R” option4=”I = ER E. None of the above” correct=”option4″]

The correct answer is $\boxed{\text{C. }I = E/R}$.

The equation $I = E/R$ is Ohm’s law, which states that the current through a resistor is directly proportional to the voltage across it and inversely proportional to the resistance of the resistor.

The equation $E = PR$ is the power equation, which states that the power dissipated by a resistor is equal to the product of the voltage across it and the current through it.

The equation $E = I^2R$ is the voltage drop equation, which states that the voltage drop across a resistor is equal to the square of the current through it times the resistance of the resistor.

The equation $I = ER$ is not a valid equation.