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Q22 (NDA-II/2014) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

Which of the following are the correct parameters for the common domestic power supply in India?

Result
Your answer: —  Â·  Correct: B
Explanation

In India, the standard domestic power supply is characterized by a potential difference of 220 V and a frequency of 50 Hz [2]. The main supply (mains) consists of a live wire and a neutral wire, with the potential difference between them maintained at 220 V [2]. While some modern technical standards may cite 230 V, the conventional value used in educational and general contexts for India is 220 V [2]. The frequency of 50 Hz is the standard for alternating current (AC) in India, distinguishing it from countries like the USA, which typically use 110-120 V at 60 Hz [1]. This 50 Hz frequency means the current changes direction 100 times per second. Using 220 V is considered more efficient for transmission over long distances compared to lower voltage systems.

Sources

  1. [2] https://en.wikipedia.org/wiki/Mains_electricity
  2. [1] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > 12.4 DOMESTIC ELECTRIC CIRCUITS > p. 204
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