In Ohm's Law, which statement best describes the relation?

• A. It describes how power relates to current and voltage.
• B. It describes the relationship between current, voltage, and resistance.
• C. It describes the relationship between energy and time
• D. It describes how impedance is calculated

Answer: (B)

Ohm's Law is about how voltage, current, and resistance are connected in a conductor. The law says the voltage across a component equals the current through it multiplied by its resistance: V = I × R. This shows a direct, proportional link between current and voltage when resistance is fixed, and it also shows that increasing resistance reduces current for a given voltage. You can rearrange the equation to solve for any quantity: current = voltage divided by resistance, voltage = current times resistance, or resistance = voltage divided by current. This direct relationship among the three quantities is why describing Ohm's Law as the connection between current, voltage, and resistance is the best choice. Power, while related through P = V × I, is a consequence of Ohm's Law rather than the defining statement itself, and impedance applies to AC circuits in a broader context, not the basic DC relationship. For example, a 10-ohm resistor with 5 volts across it draws 0.5 amperes.