The standard frequency of AC power in most countries around the world is 50 Hertz (Hz) or 60 Hertz (Hz).
In many regions, especially in Europe, Asia, Africa, Australia, and most parts of South America, the standard frequency is 50 Hz. This includes countries such as the United Kingdom, Germany, France, India, and South Africa, among others.
In the Americas (North, Central, and parts of South America), as well as some countries in the Caribbean and the Philippines, the standard frequency is 60 Hz. The United States, Canada, Mexico, Brazil, and Japan, for example, use a 60 Hz frequency.
It's important to note that while 50 Hz and 60 Hz are the most common standards, there are a few exceptions where other frequencies might be used in specific regions or for certain applications. However, the vast majority of countries adhere to either 50 Hz or 60 Hz as their standard AC power frequency.