Which quantities are the elements of Ohm's Law?

• A. Current I, impedance Z, and reactance X.
• B. Power P, energy E, and time t.
• C. Charge Q, voltage V, and inductance L.
• D. Voltage E, current I, and resistance R.

Answer: (D)

Ohm's Law describes how voltage, current, and resistance relate in a conductor: V = I R. This means the voltage across a component equals the current through it times its resistance, showing a direct proportionality between current and voltage when resistance stays constant (in ohmic materials). Because Ohm's Law ties these three quantities together, the set that lists voltage, current, and resistance is the one that matches the basic relationship.

The other options mix in quantities that aren’t part of the simple V = I R relation: impedance and reactance appear in AC analysis as components of Z, which extends Ohm's Law but isn’t the basic trio for DC or linear resistive behavior; energy and time describe different concepts; inductance relates to magnetic effects and is not one of the fundamental Ohm's Law quantities.