alleryA wire has 6 V across it and carries 2 A. What is its resistance?
A12 ohm
B4 ohm
C3 ohm
D8 ohm
Answer & Solution
Correct answer: C. 3 ohm
1. Use R = V/I.
2. R = 6 / 2 = 3 ohm; 12 comes from multiplying and 4 or 8 from adding or subtracting.
3. So the resistance is 3 ohm.
_Source: Wikipedia, Electric current, Ohm's law_
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