PhysicsChapter 7: Current Electricity
D.C.
Introduction
Direct current (d.c.) is current that flows in one direction. A battery or cell normally provides d.c.
Definition
Current Direction
In a d.c. circuit, conventional current maintains the same overall direction. Its magnitude may be constant or may vary, but it does not periodically reverse direction in the way alternating current does.
Sources
Common d.c. sources include: * cells; * batteries; d.c. power supplies; solar cells.
Applications
D.c. is widely used in: * portable electronics; * battery-powered devices; electronic circuits; charging/storage systems.
Graph
An ideal constant d.c. current plotted against time appears as a horizontal line entirely on one side of zero.
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Review the key facts, formulas and checks before you move on.D.C.
Sticky Notes · Quick Revision
D.C.
- One direction
BATTERY
- D.c. source
IDEAL GRAPH
- One side of zero