Which one is the derived quantity in SI units _____________?
Correct answer: B. Electric charge
- A. Electric current
- B. Electric charge
- C. Plane angle
- D. Amount of substance
Explanation
Electric charge is derived from electric current and time: Q = It, so its SI unit is coulomb = ampere second. Electric current, plane angle, and amount of substance are treated as base quantities in the SI system used here. Students may choose A because current appears in the formula for charge, but that makes charge derived, not current.
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