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Q104 (CDS-I/2023) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

The r.m.s. potential difference between the red live wire and black neutral wire in Indian domestic electric supply is

Result
Your answer: —  Â·  Correct: B
Explanation

In the Indian domestic electric supply system, the potential difference between the live wire (typically color-coded red) and the neutral wire (typically color-coded black) is maintained at a root mean square (r.m.s.) value of 220 V [1]. While the nominal standard for single-phase supply in India is often cited as 230 V in modern technical standards, educational textbooks and standard domestic circuit descriptions consistently specify 220 V as the standard potential difference for household appliances [2]. The live wire carries a high alternating potential, whereas the neutral wire is maintained at a potential close to that of the earth (0 V). This 220 V r.m.s. value represents the effective voltage delivered to single-phase residential connections, operating at a frequency of 50 Hz.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > EXERCISES > p. 194
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Example 11.10 > p. 189
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