The relationship V = IR is known as which law?

The relationship V = IR is known as which law?

• A. Ohm's law
• B. Boyle's law
• C. Newton's law
• D. Hooke's law

Answer: (A)

Ohm's law describes how voltage, current, and resistance relate in an electrical circuit. In V = IR, voltage is the electric push that drives charges, current is the rate of charge flow, and resistance is what opposes that flow. When resistance stays roughly constant, the current changes in proportion to the voltage—doubling the voltage doubles the current. You can also rearrange the equation to I = V / R or R = V / I, which is handy for solving for any one quantity when the other two are known. The unit of resistance is the ohm, defined as one volt per ampere. For example, applying 6 volts across a 2-ohm resistor yields a current of 3 amperes. Other well-known laws describe different phenomena: Boyle's law relates the pressure and volume of a gas, Newton's laws describe motion under forces, and Hooke's law relates the force on a spring to its displacement.

Ohm's law describes how voltage, current, and resistance relate in an electrical circuit. In V = IR, voltage is the electric push that drives charges, current is the rate of charge flow, and resistance is what opposes that flow. When resistance stays roughly constant, the current changes in proportion to the voltage—doubling the voltage doubles the current. You can also rearrange the equation to I = V / R or R = V / I, which is handy for solving for any one quantity when the other two are known. The unit of resistance is the ohm, defined as one volt per ampere. For example, applying 6 volts across a 2-ohm resistor yields a current of 3 amperes.

Other well-known laws describe different phenomena: Boyle's law relates the pressure and volume of a gas, Newton's laws describe motion under forces, and Hooke's law relates the force on a spring to its displacement.