Which of the following best describes Ohm's Law?

• A. The resistance of a conductor is inversely proportional to the voltage applied across it.
• B. The current through a resistor is independent of the voltage applied across it.
• C. The power dissipated in a resistor is given by $P=I^{2}R$.
• D. The current through a conductor between two points is directly proportional to the voltage across the two points, expressed as $V=IR$.

Answer: (D)

Verified step by step guidance

1. Understand that Ohm's Law relates the voltage (V), current (I), and resistance (R) in a conductor.
2. Recall the mathematical expression of Ohm's Law: \(V = I \times R\), where voltage is directly proportional to current when resistance is constant.
3. Recognize that this means if you increase the voltage across a conductor, the current through it increases proportionally, assuming resistance stays the same.
4. Note that the other options either describe incorrect relationships or refer to power dissipation, which is related but not the definition of Ohm's Law.
5. Conclude that the best description of Ohm's Law is: 'The current through a conductor between two points is directly proportional to the voltage across the two points, expressed as \(V = I \times R\).'