direct-current water supply

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• Direct current — (red curve). The horizontal axis measures time; the vertical, current or voltage. Direct current (DC) is the unidirectional flow of electric charge. Direct current is produced by such sources as batteries, thermocouples, solar cells, and… …   Wikipedia

• Water supply and sanitation in Portugal — is characterized by important advances in access to services, technologies and service quality over past decades (1980s ndash;1990s), partially achieved thanks to important funds from the European Union. Nevertheless, sanitation still remains… …   Wikipedia

• Water supply and sanitation in Brazil — has proved to be a resilient and resourceful sector, despite tremendous challenges and persistent inequalities in the sector. A lot has been achieved during the past decades, including a sustained improvement in efficiency and improved access.… …   Wikipedia

• Water supply and sanitation in Ireland — Water supply and sanitation services in Ireland, in contrast to most countries in the world, are provided free of charge to domestic users since 1997. Only non domestic users are billed for these services. The bulk of the costs of service… …   Wikipedia

• Water supply and sanitation in Bangladesh — Even though the water supply and sanitation sector in Bangladesh is expanding its coverage, it is difficult to keep pace with the rapid population growth. The country used to rely mainly on groundwater, which is why the discovery of arsenic in… …   Wikipedia

• Water supply and sanitation in El Salvador — Access to water supply and sanitation in El Salvador remains low, despite recent increases in coverage, which leads to negative impacts on productivity and health in particular of the rural poor. Water resources are heavily polluted and the great …   Wikipedia

• Water supply and sanitation in Chile — The three largest companies are* Aguas Andinas, serving the capital Santiago, majority owned by the Spanish company Aguas de Barcelona, * the Empresa de Servicios Sanitarios del Bio Bío ESSBIO in the sixth region and eighth region around… …   Wikipedia

• High-voltage direct current — HVDC or high voltage, direct current electric power transmission systems contrast with the more common alternating current systems as a means for the bulk transmission of electrical power. The modern form of HVDC transmission uses technology… …   Wikipedia

• Water heating — is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have… …   Wikipedia

• Water privatization in Brazil — has been initiated in 1996. In 2008 private companies provided 7 million Brazilians 4% of the urban population in 10 of the country’s 26 states with drinking water. The private sector holds 65 concession contracts in the states of São Paulo, Rio… …   Wikipedia

• Water quality — A rosette sampler is used to collect samples in deep water, such as the Great Lakes or oceans, for water quality testing. Water quality is the physical, chemical and biological characteristics of water.[1] It is a measure of the condition of… …   Wikipedia