What is the standard form of Ohm's Law?

What is the standard form of Ohm's Law?

• A. R = V ÷ I
• B. V = I × R
• C. P = V × I
• D. I = V ÷ R

Answer: (B)

Ohm's Law describes how voltage, current, and resistance relate to each other. The standard form expresses voltage as the product of current and resistance: V = I × R. This form is used because it directly shows how the voltage drop across a component depends on the current flowing through it and its resistance. For example, with a current of 3 A and a resistance of 4 Ω, the voltage is 12 V. The units line up neatly: volt = ampere × ohm. Other valid ways to write the same relationship are obtained by rearranging the equation: current equals voltage divided by resistance (I = V / R) and resistance equals voltage divided by current (R = V / I). These are useful when you know different quantities and want to solve for the one you don’t have. Also, P = V × I gives electrical power, which is related but not the basic form of Ohm's Law itself.

Ohm's Law describes how voltage, current, and resistance relate to each other. The standard form expresses voltage as the product of current and resistance: V = I × R. This form is used because it directly shows how the voltage drop across a component depends on the current flowing through it and its resistance. For example, with a current of 3 A and a resistance of 4 Ω, the voltage is 12 V. The units line up neatly: volt = ampere × ohm.

Other valid ways to write the same relationship are obtained by rearranging the equation: current equals voltage divided by resistance (I = V / R) and resistance equals voltage divided by current (R = V / I). These are useful when you know different quantities and want to solve for the one you don’t have. Also, P = V × I gives electrical power, which is related but not the basic form of Ohm's Law itself.