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Q42 (NDA-I/2016) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

A simple circuit contains a 12 V battery and a bulb having 24 ohm resistance. When you turn on the switch, the ammeter connected in the circuit would read

Result
Your answer: —  Â·  Correct: A
Explanation

The current in a simple electrical circuit is determined by Ohm's Law, which states that current (I) is equal to the potential difference (V) divided by the resistance (R), expressed as I = V/R [2]. In this specific scenario, the battery provides a potential difference of 12 V and the bulb offers a resistance of 24 Ì©. Applying the formula, the current is calculated as I = 12 V / 24 Ì© = 0.5 A [2]. An ammeter connected in series within the circuit measures this flow of charge [3]. Since the calculated current is exactly 0.5 A, it falls within the range of 0-5 A as specified in the first option. This fundamental relationship demonstrates that current is inversely proportional to resistance for a constant voltage source [2].

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Solution > p. 184
  2. [2] https://satheeneet.iitk.ac.in/article/physics/ohm-s-law/
  3. [3] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Activity 11.4 > p. 182
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