Ohm's Law describes what?

• A. The relationship between impedance and admittance
• B. The relationship between charge and capacitance
• C. The relationship between power and energy
• D. The relationship between current, voltage, and resistance.

Answer: (D)

Ohm's Law is about how current through a conductor depends on the voltage across it and the conductor's resistance. In simple DC terms, it’s written as I = V / R, meaning current is proportional to voltage and inversely proportional to resistance. If you raise the voltage while keeping resistance the same, the current increases; if you raise the resistance with the same voltage, the current decreases. This one relationship lets you predict how a circuit responds when you change voltage or resistance, or when you pick a resistor for a desired current.

In AC circuits the idea broadens a bit to include impedance, which combines resistance and reactance, and the relationship becomes V = I Z. But the core idea remains that current, voltage, and resistance (or impedance) are interconnected in determining how much current flows.

The other options describe different electrical concepts, such as the link between charge and capacitance or between power and energy, or the broader AC concept of impedance and admittance. They’re related topics, but Ohm's Law in its basic form is about the direct relationship among current, voltage, and resistance.