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NEET PHYSICSUNITS AND MEASUREMENTSEasy

Question

Which of the following represents a volt?

A

Joule/second

B

Watt/Ampere

C

Watt/Coulomb

D

Coulomb/Joule

Step-by-Step Solution

  1. Identify the Physical Quantity: The 'volt' (VV) is the SI unit of electric potential and potential difference.
  2. Analyze Relationships:
  • Power Relationship: Electrical power (PP) is the product of voltage (VV) and current (II), given by P=VIP = VI. Rearranging this for voltage gives V=PIV = \frac{P}{I}.
  • Unit Substitution: Substituting the SI units for power (Watt, WW) and current (Ampere, AA), we get 1 Volt=1 Watt1 Ampere1 \text{ Volt} = \frac{1 \text{ Watt}}{1 \text{ Ampere}}. Thus, a volt can be represented as Watt/Ampere.
  • Work Relationship: Potential is also defined as work done per unit charge, V=WQV = \frac{W}{Q}, which corresponds to the unit Joule/Coulomb (J/CJ/C).
  1. Evaluate Other Options:
  • Joule/second represents the Watt (unit of Power).
  • Watt/Coulomb does not correspond to a standard simple unit in this context.
  • Coulomb/Joule represents the inverse of potential (1/V1/V).
  1. Conclusion: The correct representation among the choices is Watt/Ampere.

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.

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