A resistor is connected to a 12 V supply and draws 3 A. What is its resistance?

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Study for the IGCSE Physics Electricity Test. Master key concepts with flashcards and multiple choice questions, each providing hints and explanations. Prepare with confidence for your exam!

Multiple Choice

A resistor is connected to a 12 V supply and draws 3 A. What is its resistance?

Explanation:
Ohm's law links voltage, current, and resistance through R = V / I. With a 12 V supply driving 3 A, the resistance is R = 12 ÷ 3 = 4 Ω. This value exactly matches the given current for that voltage. If the resistance were larger, the current would be smaller than 3 A; if it were smaller, the current would be greater than 3 A.

Ohm's law links voltage, current, and resistance through R = V / I. With a 12 V supply driving 3 A, the resistance is R = 12 ÷ 3 = 4 Ω. This value exactly matches the given current for that voltage. If the resistance were larger, the current would be smaller than 3 A; if it were smaller, the current would be greater than 3 A.

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