Ohm's Law is commonly expressed as which formula?

Ohm's Law is commonly expressed as which formula?

• A. E = IR
• B. V = IR
• C. I = VR
• D. P = VI

Answer: (B)

Understanding how voltage, current, and resistance relate in a circuit is what Ohm's law describes. The widely used expression is voltage equals current times resistance, V = IR. This form directly shows how current responds to voltage for a given resistance: if you raise the voltage across the resistor, more current flows; if you raise the resistance, less current flows for the same voltage. It's the most straightforward way to connect all three quantities in one simple equation, and you can rearrange it to solve for any one of them—I = V / R or R = V / I. In some contexts, E = IR is seen, where E stands for electromotive force, but for analyzing the voltage across a component in a circuit, V = IR is the standard expression. The form P = VI relates to power, and while it can be derived from Ohm's law, it describes a different quantity and isn't the fundamental relationship among voltage, current, and resistance.

Understanding how voltage, current, and resistance relate in a circuit is what Ohm's law describes. The widely used expression is voltage equals current times resistance, V = IR. This form directly shows how current responds to voltage for a given resistance: if you raise the voltage across the resistor, more current flows; if you raise the resistance, less current flows for the same voltage. It's the most straightforward way to connect all three quantities in one simple equation, and you can rearrange it to solve for any one of them—I = V / R or R = V / I.

In some contexts, E = IR is seen, where E stands for electromotive force, but for analyzing the voltage across a component in a circuit, V = IR is the standard expression. The form P = VI relates to power, and while it can be derived from Ohm's law, it describes a different quantity and isn't the fundamental relationship among voltage, current, and resistance.