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Difficulty: MediumFundamental and Derived Quantities

During an investigation on electrical circuits, a student measures electric current, potential difference, time, and thermodynamic temperature. Which of the measured physical quantities is a derived quantity?

  1. A
    Electric current
  2. Potential differenceAnswer
  3. C
    Time
  4. D
    Thermodynamic temperature

Answer

Potential difference
Potential difference is a derived physical quantity because it is derived from work (energy) and electric charge (V=WQ=WI⋅tV = \frac{W}{Q} = \frac{W}{I \cdot t}), unlike electric current, time, and thermodynamic temperature which are fundamental SI quantities.

Step-by-Step Solution

1
Identify fundamental (base) physical quantities
The seven SI fundamental quantities are mass, length, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity.
Fundamental quantities are basic quantities that do not depend on any other physical quantity.
2
Classify the given quantities
Electric current, time, and thermodynamic temperature are base quantities. Potential difference (V=WQV = \frac{W}{Q}) is derived from work and electric charge.
Derived quantities are physical quantities defined by combining fundamental quantities.

Key Concept

Fundamental and Derived Quantities
Estimated Time:1m 0s
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Topics

Fundamental and Derived Quantities

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