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NEET PHYSICSUNITS AND MEASUREMENTSEasy

Question

Unit of power is:

A

Kilowatt

B

Kilowatt-hour

C

Dyne

D

Joule

Step-by-Step Solution

Power is defined as the time rate at which work is done or energy is transferred (P=dW/dtP = dW/dt).

  1. SI Unit: The SI unit of power is the watt (W), where 1 W=1 J s−11 \text{ W} = 1 \text{ J s}^{-1} .
  2. Kilowatt (kW): This is a multiple of the SI unit, where 1 kW=1000 W1 \text{ kW} = 1000 \text{ W}. It is a valid unit of power.
  3. Analysis of other options:
  • Kilowatt-hour (kWh): This is a commercial unit of electrical energy, defined as 3.6×106 J3.6 \times 10^6 \text{ J} . It is often confused with power but represents the total energy consumed.
  • Joule (J): This is the SI unit of work and energy .
  • Dyne: This is the CGS unit of force (not explicitly defined in the provided text, but distinct from power).

Exam Context & Concepts Covered

This question aligns with the NEET PHYSICS syllabus, specifically targeting concepts from UNITS AND MEASUREMENTS. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

PHYSICSUNITS AND MEASUREMENTS

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