A Level Physics Practice Exam

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Study for the A Level Physics Exam efficiently with engaging quizzes and multiple-choice questions designed to enhance your understanding. Prepare yourself for the challenges of A Level Physics!

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In a situation with an ohmic conductor, what relationship exists between voltage and current?

Voltage is inversely proportional to current
Voltage varies non-linearly with current
Voltage is directly proportional to current
Voltage is independent of current

The correct answer is: Voltage is directly proportional to current

In an ohmic conductor, the relationship between voltage and current is defined by Ohm's Law, which states that the voltage across a conductor is directly proportional to the current flowing through it. Mathematically, this relationship is expressed as V = IR, where V is the voltage, I is the current, and R is the resistance of the conductor, which remains constant for ohmic materials. This proportionality indicates that if the current through the conductor increases, the voltage will also increase in a linear fashion, assuming resistance does not change. This direct proportionality reflects how ohmic conductors obey this simple linear relationship, making it a fundamental principle in electrical circuits. If you double the current, the voltage will also double, illustrating that the two quantities are tightly linked in a predictable manner.