This presentation summarizes key concepts in electrical circuits including Kirchhoff's Current Law (KCL), mesh analysis, current divider rule, equivalent resistance, series and parallel circuits, and superposition theorem. It introduces electrical circuits as paths for electron flow from a voltage or current source. Specific topics covered include KCL, mesh analysis techniques and examples, using the current divider rule to determine current flow in parallel branches, calculating equivalent resistance, distinguishing series and parallel components, and applying the superposition theorem by considering one source at a time in linear circuits.

1. Presentation
on
Electrical Circuits
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2. Group:6
Name Id
Md Tawhidul Islam 171-15-9191
Md Jakiul Rashid Khan 171-15-8554
Asma Sadia Akhi 171-15-8757
Nusrat Jahan eva 171-15-8937
Md Alamin Shah 171-15-8823
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3. Presentation Topics:
 KCL (Kirchhoff’s Current Law)
 Mesh
 CDR(Current Divider Rule)
 REQ(Resistance Equivalent)
 Super position
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4. Introduction:
What is Electrical Circuits
???
An electric circuit is a path
in which electrons from
a voltage or current source
flow.
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5. KCL (Kirchhoff’s Current Law)
The Algebraic sum
of all the current
entering (or leaving)
a node is equal to
zero…..
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9. Mesh
Mesh analysis is a method that is used
to solve planar circuits for the currents
at any place in the electrical circuit.
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10. Mesh Analysis
Find mesh(loops).
Apply KVL & V=IR.
Write equation.
Solve equation and find electricity .
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11. Mesh Analysis Example
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12. Current Divider
 In “series circuits” the current always remains
same through all components
 In “parallel circuits” the current doesn’t
remains same,instead it divides
 To find the amount of current divided in
resistors the current divider formula is used
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13. Current Divider Rule (CDR)
#CDT is useful in determining the current flow through one
branch of parallel circuit
 Where” Ix = the current flow through any parallel
branches.
Rx = determined resistance
REQ =the total resistance of parallel branch.
Is = the circuit applied current
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14. SOME EXAMPLE
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17. Equivalent or Total Resistance
- Req
Equivalent Resistance is the total resistance of a circuit.
Req is equivalent to the resistor network on the left in the
sense that they have the same i-v characteristics.
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18. Series Resistance
Two elements are in series if the current that
flows through one must also flow through the
other.
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19. Parallel Resistance
Two elements are in parallel if they are connected between
the same two end nodes.
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20. Series VS Parallel
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21. Superposition Theorem
 The superposition theorem states that in a linear
circuit with several sources, the current and voltage
for any element in the circuit is the sum of the
currents and voltages produced by each source
acting independently.
 To calculate the contribution of each source
independently, all the other sources must be
removed and replaced without affecting the final
result.
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22. Applicable circuit:
Circuit-1: Circuit-2:
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23. Procedure for
applying
superposition
theorem:
 Circuit containing
independent sources:
 Consider only one
source at a time.
 Remove all other voltage
sources and current
sources.
 Voltage sources will be
replaced by short circuit
and
 Current sources will be
replaced by open circuit
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24. Example
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