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Q56 (NDA-I/2009) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

Which one of the following statements correctly defines power?

Result
Your answer: —  Â·  Correct: A
Explanation

In physics, power is defined as the rate at which work is done or the rate at which energy is transferred or consumed. Specifically, it is the energy supplied or transformed per unit time [c1][t6]. The standard unit for power is the watt (W), which is equivalent to one joule per second [c1]. In contrast, the other options describe different forms of energy rather than power itself: energy due to motion is defined as kinetic energy [t1][t4][t7], and energy due to an object's position (often relative to a force field like gravity) is defined as potential energy [t1][t2][t10]. Therefore, while kinetic and potential energy represent the capacity to do work, power measures how quickly that energy is being utilized or converted [t6].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > 11.8 ELECTRIC POWER > p. 191
  2. [2] https://kids.britannica.com/kids/article/energy/353100
  3. [3] https://www.eia.gov/kids/what-is-energy/forms-of-energy.php
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