direct & alternating currents gr 9 science. direct current (dc) the current from a cell is...
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Direct & Alternating Currents
Gr 9 Science
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Direct Current (DC)
• The current from a cell is called direct current because charged particles travel through a circuit in only one direction. In a cell, the electrons move from the negative to the positive terminal.
• Electronic devices such as MP3 players and cellphones use rechargeable batteries to supply DC current.
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Alternating Current (AC)
• In an AC, the electrons move back and forth in the circuit, but there is no net movement of electrons in either direction.
• The electrical wires in our homes are part of a circuit that includes generation of electricity in a power station, to a transformer (an electrical device that changes the potential difference of an AC), transmission across the province, to substations and distribution to individual homes.
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• AC is used in homes and buildings because it can be transmitted at high potential difference over long distances, with only a small loss of electrical energy.