Question

In domestic Indian house, the values of AC electrical power and frequency we receive are __________.

• A. 220 V and 50 Hz
• B. 240 V and 60 Hz
• C. 240 V and 50 Hz
• D. 220 V and 60 Hz

Hint:

Remember the standard Indian rating:
Voltage = \(220\text{ V}\) AC.
Frequency = \(50\text{ Hz}\).
This is a standard memorization fact for competitive exams.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks for the standard RMS voltage and frequency specifications of the alternating current (AC) power supplied to residential homes in India.

Step 2: Key Formula or Approach:
The domestic power grid standards vary by country. This is a factual, standard specification question for India's electrical grid.

Step 3: Detailed Explanation:

• In India, the standard voltage for single-phase domestic household AC electricity is \(220\text{ V}\) (Root Mean Square value).

• The frequency of this alternating current is \(50\text{ Hz}\) (Hertz), meaning the current changes its direction 100 times every second.

• Countries like the United States use a standard of \(120\text{ V}\) and \(60\text{ Hz}\), whereas India and most European nations follow the \(220\text{--}240\text{ V}\) and \(50\text{ Hz}\) system to optimize power transmission efficiency over long distances.


Step 4: Final Answer:
The received specifications are 220 V and 50 Hz.