ELECTRIC CIRCUITS

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ELECTRIC CIRCUITS
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Electrical Circuits

• Study of charges in motion
• Circuit pathway for the charges
• Current (I) Rate of flow of charge
• Ampheres (amp) (A) unit of current

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Electrical Current (I)

• Measure of Rate of Flow of charge

Current flow
1 Amp 1 Coulomb
second
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Electrical Circuits

• Symbols

ammeter

R
power supply
-
resistor
I
voltmeter
Ammeter connected in series
Voltmeter connected in parallel
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SIMPLE CIRCUIT SCHEMATIC
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SIMPLE CIRCUIT 3-D VIEW
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SIMPLE CIRCUIT SCHEMATIC
3-D VIEW
SCHEMATIC
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Light Bulb
-

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RESISTANCE vs. TEMP
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RESISTANCE vs. TEMP
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Ohms Law
I a DV
DV
R
(RESISTANCE)
I
UNIT OF RESISTANCE IS OHM (W)
DV IR
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CIRCUIT DIAGRAM
DV IR
1 W
R
1V
1 V
1 W
1A
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Series Circuit
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Series Circuit
IT I1 I2 I3 .
DVT DV1 DV2 DV3 .
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SERIES RESISTORS
IT I1 I2 I3 .
DVT DV1 DV2 DV3 .
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SERIES RESISTORS
IT I1 I2 I3 .
DVT DV1 DV2 DV3 .
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SERIES RESISTORS
IT I1 I2 I3 .
DVT DV1 DV2 DV3 .
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SERIES CIRCUIT
IT I1 I2 I3 .
DVT DV1 DV2 DV3 .
DV IR
RT IT R1 I1 R2 I2 R3 I3 .
RT R1 R2 R3 .
RESISTANCE ADDS UP!
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SERIES CIRCUIT
DV IR
IT I1 I2 I3 .
DVT DV1 DV2 DV3 .
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Parallel Circuit
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Parallel Circuit
IT I1 I2 I3
DVT DV1 DV2 DV3
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PARALLEL RESISTORS
IT I1 I2
DVT DV1 DV2
I1
I2
DV1
DV2
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PARALLEL RESISTORS
IT I1 I2
DVT DV1 DV2
I1
I2
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PARALLEL FALLS
IT I1 I2
DVT DV1 DV2
I1
I2
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PARALLEL CIRCUITS
IT I1 I2
DVT DV1 DV2
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PARALLEL CIRCUIT
IT I1 I2 I3 .
I DV /R
DVT DV1 DV2 DV3 .
THE MORE RESISTORS, THE LESS THE RESISTANCE!
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Combo Circuit
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Combo Circuit
DV2 DV3
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Combo Circuit
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Combo Circuit
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Combo Circuit
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Combo Circuit
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ENERGY vs POWER
Energy q DV
time
t
P I DV
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P IDV
66m
56m
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Taughannock Falls66 m (215 ft)
P IDV
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ELECTRICAL POWER
P I DV
P I2R
DV IR
P I DV
P DV2/R
I DV /R
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ELECTRICAL POWER
P I DV
P I2R
P DV2/R
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SERIES CIRCUITS
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SERIES CIRCUITS
DV IR
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SERIES CIRCUITS
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SERIES CIRCUITS
DV IR
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SERIES CIRCUITS
DV IR
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SERIES CIRCUITS
DV IR
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PARALLEL CIRCUITS
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PARALLEL CIRCUITS
DV IR
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PARALLEL CIRCUITS
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PARALLEL CIRCUITS
DV IR
IT I1 I2 I1
DVT DV1 DV2
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PARALLEL CIRCUITS
DV IR
IT I1 I2 I1
DVT DV1 DV2
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PARALLEL CIRCUITS
DV IR
IT I1 I2 I1
DVT DV1 DV2
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COMBO CIRCUITS
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COMBO CIRCUITS
DV IR
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Combo Circuit
DV2 DV3
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COMBO CIRCUITS
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COMBO CIRCUITS
R1 4W
18 V
6W
3W
DV IR
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COMBO CIRCUITS
DV IR
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COMBO CIRCUITS
DV IR
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COMBO CIRCUITS
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COMBO CIRCUITS
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EQUIVALENT RESISTANCE
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EQUIVALENT RESISTANCE
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C.A. Equivalent Resistance 1
labreq3
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C.A. Equivalent Resistance 2
labreq1
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C.A. Equivalent Resistance 3
labreq4
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C.A. Equivalent Resistance 4
labreq2
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Circuit Analysis 1
labreq3
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Circuit Analysis 1
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Circuit Analysis 2
labreq1
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Circuit Analysis 2
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C.A. Equivalent Resistance 3
labreq4
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C.A. Equivalent Resistance 4
labreq2
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RESISTANCE
R vs LENGTH ( l )
R a l
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RESISTANCE
R vs X-SECTION AREA (A)
A
A
R a 1/A
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RESISTANCE
R a l
R a 1/A
RA/l CONSTANT r
r RESISTIVITY
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RESISTANCE
R r l / A
r RESISTIVITY
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RESISTIVITY
r R A / l
r W m
Units?
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RESISTIVITY VALUES _at_20 oC
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RESISTANCE
R vs Temperature
DR a DT
(SEE IP SIM)
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Temp Effect on Current
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Temp Effect on Current
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COST OF ELECTRICITY
POWER ENERGY
TIME
ENERGY POWER TIME
KILOWATT HR
KWHR
1 KWHR 10 15 CENTS
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