circuit analysis
DESCRIPTION
OHM’S LAW. CIRCUIT ANALYSIS. ENGR . VIKRAM KUMAR B.E (ELECTRONICS) M.E (ELECTRONICS SYSTEM ENGG :) MUET JAMSHORO. Electrical Meters. Ammeters measure current in amperes and are always wired in series in the circuit. AMPS. Voltmeters measure potential in volts and are always - PowerPoint PPT PresentationTRANSCRIPT
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CIRCUIT ANALYSIS
ENGR. VIKRAM KUMAR
B.E (ELECTRONICS)M.E (ELECTRONICS SYSTEM ENGG:)MUET JAMSHORO
OHM’S LAW
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AMPS
volts
Ammeters measurecurrent in amperes
and are alwayswired in series in
the circuit.
Voltmeters measurepotential in voltsand are always
wired in parallel in the circuit.
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wiring
battery
voltmeter
ammeter
resistance
capacitor
+ -
A
V
junction
terminal
AC generator
Variableresistance
Variablecapacitor
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ELECTRON PUMP
(SOURCE VOLTAGE)[ENERGY IN]
LOAD(RESISTANCE)
[ENERGY OUT]
CONDUCTOR
ELECTRONSOUT OF SOURCE
ELECTRONSOUT OF LOAD
ELECTRONSBACK TOSOURCE
ELECTRONSINTOLOAD
HIGHER ENERGY ELECTRONS LOWER ENERGY ELECTRONS
CONDUCTOR
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PotentialIn volts
(joules / coul)
CurrentIn amperes
(coul / second)
ResistanceIn ohms
(volts / amp)
Drop across a resistance
Current passingThrough the
resistor
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volts
Batterycurrent
Electrons haveLess Energy
Electrons haveMore Energy Electrons get
An energy boost
current
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volts
Resistor current
Electrons haveMore Energy
Electrons haveLess Energy Energy is lost
In the resistor
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4.2 - Ohm’s Law
Every conversion of energy from one form to another can be related to this equation.
In electric circuits the effect we are trying to establish is the flow of charge, or current. The potential difference, or voltage between two points is the cause (“pressure”), and resistance is the opposition encountered.
OppositionCause
Effect
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Ohm’s Law
Simple analogy: Water in a hose Electrons in a copper wire are analogous to water in
a hose. Consider the pressure valve as the applied voltage
and the size of the hose as the source of resistance. The absence of pressure in the hose, or voltage across
the wire will result in a system without motion or reaction.
A small diameter hose will limit the rate at which water will flow, just as a small diameter copper wire limits the flow of electrons.
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Ohm’s Law
Where: I = current (amperes, A)E = voltage (volts, V)R = resistance (ohms, )
RE
I
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4.3 - Plotting Ohm’s Law
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There are three generally types of electrical circuits:
(1) Series circuits in which the current created by the voltagesource passes through each circuit component in succession.
R2 A2
R 1
R 3
A1
Arrows showCurrent pathThrough eachcomponent
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(2) Parallel circuits in which the current created by the voltagesource branches with some passing through one component andwhile the rest of the current passes through other components.
Arrows showCurrent pathThrough eachcomponent
Junction or Branching points
A1R1
R2
R3
A2
A3
A4
R 4
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(3) Series Parallel circuits or combination circuits which contain series segments and parallel
segments.
R1
R2
R3
A1
A2
A3
A4
R 4
SERIES
PARALLEL
Arrows showCurrent pathThrough eachcomponent
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All electrical circuit analysis requires the useof two fundamental laws called
Kirchhoff’s Laws
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FIRST LAWAll current entering a junction point must
equal all current leaving that junction point
Junctionpoint
Current Entering ( I1 )
Current Leaving ( I2 )
Current Leaving ( I3 )
I1 = I2 + I3
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SECOND LAWAround any complete loop, the sum of the
voltage rises must equal the sum of voltage drops
Battery(voltage rise)
Resistance 1(voltage drop 1)
Resistance 2(voltage drop 2)
Resistance 3(voltage drop 3)
Current flow
Complete loop
V(Battery) = V1 + V2 + V3
+ -
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R2
R1
A2
A1
At
V1
EMF
Kirchhoff’s Laws Around a loop
S V rises = V dropsA loop is a completedPath for current flow
Battery
V2
Loop #1
Loop #2
Loop #3
+ -
Complete currentPaths in a circuit
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When using Kirchhoff’s laws we apply the principlesof conventional current flow.
When current leaves the positive (+) terminal of a voltage source and enters the negative (-) terminal a voltage rise occurs across the source. If the current
enters the positive and exits the negative a of a voltagesource a voltage drop occurs across the source.
When tracing a current loop, if the assumed directionof the current and the loop direction are the same,
a voltage drop occurs across a resistance.If the assumed direction of the current and the
loop direction are opposite, a voltage rise occursacross the the resistance.
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Battery( 6 volts)
+ -
CurrentflowV = + 6 v
Currentflow
V = - 6 v
When using Kirchhoff’s laws we apply the principlesof conventional current flow.
When current leaves the positive (+) terminal of a voltage source and enters the negative (-) terminal
a voltage rise occurs across the source.
If the current enters the positive and exits the negative a of a voltage source a voltage drop occurs across
the source.
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When tracing a current loop, if the assumed directionof the current and the loop direction are the same,
a voltage drop occurs across a resistance.
resistor
V = + 6 vA voltage
rise
AssumedCurrent flow
V = - 6 vA voltage
dropLoop
direction
AssumedCurrent flow
Loopdirection
If the assumed direction of the current and theloop direction are opposite, a voltage rise occurs
across the the resistance.
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