If you are searching for the specific technical value that powers the nation’s grid, you have come to the right place. Whether for an exam question or general knowledge, completing this sentence is fundamental to understanding Indian electrical infrastructure.

In India, the standard frequency of AC power supply is 50 Hz (Hertz).

The Complete Answer

To be technically precise, the domestic power supply in India is governed by the following standard parameters:

• Frequency: 50 Hz
• Voltage: 230 V (Volts)

This means that the alternating current (AC) flowing through our wires changes its direction 50 times every second.

Comparison with Other Countries

It is important to know this because not every country follows the same rule.

• India / UK / Europe: Use 50 Hz.
• USA / Canada: Use 60 Hz.

This is why electronic appliances bought in the USA often need a converter when brought to India. If you plug a 60 Hz device directly into an Indian 50 Hz socket, the motor may run slower, overheat, or burn out because the frequency does not match.

Why was this specific frequency chosen?

The reason lies in history. During the early days of electrification, India adopted the British standard of power generation. Since the United Kingdom used 50 Hz equipment, India’s developing infrastructure was built to support the same. Over decades, this became the permanent standard, and changing it now would require replacing millions of transformers and generators across the country.

So, the next time you see the question “In India the standard frequency of AC power supply is…”, you know the answer is 50 Hz.