A Level Physics Practice Exam

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Study for the A Level Physics Exam. Our quiz features flashcards and multiple choice questions, each with hints and explanations. Prepare thoroughly!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What does Ohm's law state about the relationship between current and potential difference?

Current is inversely proportional to the potential difference
The current is directly proportional to the potential difference for a conductor at a constant temperature
Current and potential difference are unrelated
The potential difference is constant regardless of current

The correct answer is: The current is directly proportional to the potential difference for a conductor at a constant temperature

Ohm's law fundamentally describes how current and potential difference (voltage) are related in a conducting material, specifically highlighting that when a conductor is at a constant temperature, the current flowing through it is directly proportional to the potential difference applied across its ends. This means that if you increase the voltage, the current flowing through the conductor also increases, provided the temperature remains constant. This linear relationship can often be expressed mathematically as V = I × R, where V is the potential difference, I is the current, and R is the resistance. In practical terms, this relationship allows for predictable behavior in electrical circuits, making it fundamental in the study and application of electrical engineering. Understanding this concept is crucial, as it provides a foundational basis for analyzing various electrical systems and components, whether in simple circuits or complex designs.