Traveller's cheques and credit cards (American Express, Visa, Mastercard) are exchanged for Vietnamese dong at the banks. Cards can be used in travel agencies, hotels, and major restaurants. US currency is exchanged for Vietnamese dong and treasury notes in banks, exchange bureaus, hotels, and jewellery shops.
Nikola Tesla designed the first hydroelectric power plant at Niagara Falls, New York which started producing electrical power in 1895. This was the beginning of the electrification of the United States and the rest of the world. Today, Teslaâs AC electricity is lighting and powering the globe.
The first use of moving water to produce electricity was a waterwheel on the Fox river in Wisconsin in 1882, two years after Thomas Edison unveiled the incandescent light bulb. The first of many hydro electric power plants at Niagara Falls was completed shortly thereafter.ydro-electric power has always been an important part of the world's electricity supply, providing reliable, cost effective electricity, and will continue to do so in the future. Hydro power has environmental impacts which are very different from those of fossil fuel power plants.