Direct & Alternating Currents Gr 9 Science. Direct Current (DC) The current from a cell is called...
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Transcript of Direct & Alternating Currents Gr 9 Science. Direct Current (DC) The current from a cell is called...
![Page 1: Direct & Alternating Currents Gr 9 Science. Direct Current (DC) The current from a cell is called direct current because charged particles travel through.](https://reader036.fdocuments.in/reader036/viewer/2022082422/5697bff01a28abf838cbaa6d/html5/thumbnails/1.jpg)
Direct & Alternating Currents
Gr 9 Science
![Page 2: Direct & Alternating Currents Gr 9 Science. Direct Current (DC) The current from a cell is called direct current because charged particles travel through.](https://reader036.fdocuments.in/reader036/viewer/2022082422/5697bff01a28abf838cbaa6d/html5/thumbnails/2.jpg)
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.
![Page 3: Direct & Alternating Currents Gr 9 Science. Direct Current (DC) The current from a cell is called direct current because charged particles travel through.](https://reader036.fdocuments.in/reader036/viewer/2022082422/5697bff01a28abf838cbaa6d/html5/thumbnails/3.jpg)
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.
![Page 4: Direct & Alternating Currents Gr 9 Science. Direct Current (DC) The current from a cell is called direct current because charged particles travel through.](https://reader036.fdocuments.in/reader036/viewer/2022082422/5697bff01a28abf838cbaa6d/html5/thumbnails/4.jpg)
• 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.