The correct option is 50 Hz.
Explanation
Alternating Current (AC) is the form of electric power delivered to businesses and residences. The frequency of AC determines the number of complete cycles the current undergoes in one second, measured in Hertz (Hz).
Detailed Analysis:
- In India, the standard frequency for domestic AC supply is 50 Hz. This implies that the current completes 50 cycles per second. Since the polarity changes twice in every cycle, the current changes direction 100 times per second.
- The standard voltage associated with this supply in India is typically 220 V to 240 V.
- This standard differs from countries like the United States, which typically use a frequency of 60 Hz at a lower voltage of 110 V to 120 V.
Key Takeaway:
The standard domestic electric supply in India is 220 V, 50 Hz Alternating Current (AC).