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D.c.
Direct current (d.c.) is current that flows in one direction.
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D.c.
Recommended for Class 10
D.c.
Direct current (d.c.) is current that flows in one direction.
A battery or cell normally provides d.c.
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.
D.c. — Advanced
Common Mistakes
Common Mistakes
- Mistake
D.c. does not necessarily mean the value must never change.
- Mistake
The defining feature is one-direction current.
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- Definition
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Practice
PQ
Q1. Define d.c.
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Q2. Name d.c. sources.
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Q3. Describe the graph of ideal constant d.c.
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Q4. Give applications of d.c.
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Q5. Clarify whether d.c. magnitude must always be constant.
Exam Practice
EQ
Q1. Define d.c.
EQ
Q2. Name d.c. sources.
EQ
Q3. Describe the graph of ideal constant d.c.
EQ
Q4. Give applications of d.c.
EQ
Q5. Clarify whether d.c. magnitude must always be constant.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.