A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
Correct answer: C. R3 > R2 > R1
- A. R1 = R2 = R3
- B. R1 > R2 > R3
- C. R3 > R2 > R1
- D. R2 > R3 > R1
Explanation
V=IR, current is inversely proportional to resistance. The line which is most closest to I axis has the least resistance and vice versa.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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