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Electric Circuits
OHM’s LAW
V= I R or E = I R
Variable Unit
Voltage V Volts
Current I amps
Resistance R ohms
Series Circuit
A circuit that has only one path for the electrons to flow.
Rules for Series
Rtot = R1 + R2 + Rn
Itot = I1 = I2 = In
Vtot = V1 + V2 + Vn
Schematic Symbols
Battery
Switch
resistor
Series example 1
R I V P
R1 5
R2 15
R3 30
Rt 2
Series example 2
R I V P
R1 3
R2 5
R3 22
Rt 120
Series example 3
R I V P
R1 25
R2 5
R3 10
Rt 4
Series example 4
R I V P
R1 10
R2 10
R3 30
Rt 3
Series Quiz
R I V P
R1 5
R2 15
R3 20
Rt 120
Parallel Circuits
Circuits that have multiple paths for the electrons to follow
Rules for Parallel
1 = 1 + 1 + 1
Rtot R1 R2 Rn
Itot = I1 + I2 + I n
Vtot = V1 = V2 = Vn
Parallel Ex 1
R I V P
R1 48
R2 48
R3 48
R4 48
Rt 24
Parallel Ex 2
R I V P
R1 12
R2 20
R3 10
R4 10
Rt 4
Parallel Ex 3
R I V P
R1 40
R2 40
R3 40
R4 40
Rt 4
Quiz time
Combination Circuits
R I V P
R1 5
R2 30
R3 30
Rt 2
R I V P
R1 30
R2 15
R3 30
R4 30
Rt 50
R I V P
R1 10
R2 10
R3 14
R4 15
R5 15
R6 10
Rt 3
R I V P
R1 25
R2 7
R3 3
R4 5
R5 5
R6 10
Rt 3
Combination Circuit
Practice
R I V P
R1 15
R2 50
R3 50
Rt 160
R I V P
R1 15 4 60 240
R2 50 2 100 200
R3 50 2 100 200
Rt 40 4 160 640
R I V P
R1 10
R2 15
R3 48
R4 48
Rt 4
R I V P
R1 10 2.4 24 57.6
R2 15 1.6 24 38.4
R3 48 2 96 192
R4 48 2 96 192
Rt 30 4 120 480
R I V P
R1 40
R2 40
R3 5
R4 15
R5 30
R6 15
Rt 100
R I V P
R1 40 1 40 40
R2 40 1 40 40
R3 5 2 10 20
R4 15 2 30 60
R5 30 .7 20 14
R6 15 1.3 20 26
Rt 50 2 100 200
R I V P
R1 30
R2 6
R3 6
R4 3
R5 9
R6 14
Rt 4
R I V P
R1 30 4 120 480
R2 6 2 12 24
R3 6 2 12 24
R4 3 2 6 12
R5 9 2 18 36
R6 14 4 56 224
Rt 50 4 200 800
![public.rcas.org · Web viewIn electric circuits, energy is measured in volts, which is actually energy per charge [1 V = 1 J/C]. Ohm’s Law gives the relationship between these quantities:](https://img.pdfslide.us/doc/110x75/5eaeeb95ae9533481223a08a/web-view-in-electric-circuits-energy-is-measured-in-volts-which-is-actually-energy.jpg)
