Which statement correctly describes Ohm's Law?

Which statement correctly describes Ohm's Law?

• A. It relates voltage, current, and resistance.
• B. It relates power and energy only.
• C. It relates charge and time.
• D. It relates frequency and impedance.

Answer: (A)

Voltage, current, and resistance are linked by Ohm's Law: in its basic form, voltage equals current times resistance (V = I × R). This means knowing any two of these quantities lets you determine the third. For example, with a 9-volt source across a 3-ohm resistor, the current is 3 amperes. If you keep the resistance the same but double the voltage, the current doubles as well. In DC circuits, this simple proportional relationship is the foundation for analyzing how changing one quantity affects the others. The other statements touch on related ideas—power and energy involve P = V I and E = P t; charge relates to current via I = Q/t; and in AC circuits, impedance depends on frequency—but Ohm's Law itself is about the direct relationship among voltage, current, and resistance in a circuit.

Voltage, current, and resistance are linked by Ohm's Law: in its basic form, voltage equals current times resistance (V = I × R). This means knowing any two of these quantities lets you determine the third. For example, with a 9-volt source across a 3-ohm resistor, the current is 3 amperes. If you keep the resistance the same but double the voltage, the current doubles as well. In DC circuits, this simple proportional relationship is the foundation for analyzing how changing one quantity affects the others. The other statements touch on related ideas—power and energy involve P = V I and E = P t; charge relates to current via I = Q/t; and in AC circuits, impedance depends on frequency—but Ohm's Law itself is about the direct relationship among voltage, current, and resistance in a circuit.