Circuits and Ohms Law

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Circuits and Ohms Law
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Series Circuit
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Series Circuit
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Series Circuit
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Ohms Law
V I R
V
V
I
R
V
I R
R
I
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Battery 12 Volts
Headlight R 1.1?
Solve for current flow (I)
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Battery 12 Volts
Headlight R 1.1?
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Battery 12 Volts
Headlight R 1.1?
V
I
I 10.9 Amperes
R
12
I
1.1
9
What is the value of R ?
I 0.33 A
V 9
t
R ?
10
I 0.33 A
V 9
t
R ?
V
R
choose formula
I
Solution
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I 0.33 A
V 9
t
R ?
V
R
choose formula
I
9
Solution
R
substitute values
0.33
12
I 0.33 A
V 9
t
R ?
V
R
R 27.27 Ohms
I
9
Solution
R
0.33
13
What would change ifI 33mA?
I 33 mA
V 9
t
R ?
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I 0.033 A
V 9
t
R ?
Solution
V
R
R 272.7 Ohms
I
9
Less current is due to more resistance
R
0.033
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Series Circuit
R1
V
R2
t
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Series Circuit
R1 1K
V 9V
R2 560
t
What is the total resistance (Rtotal or Rt) in
this circuit?
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Series Circuit
R1 1K
V 9V
R2 560
t
Rtotal 1000 560 Rtotal 1560
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Series Circuit
R1 1K
V 9V
R2 560
t
What is the current (I) in this circuit?
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Series Circuit
R1 1K
I V/R I 9/1560 I 0.00577 Amperes I 5.77 mA
V 9V
R2 560
t
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Equivalent Series Circuit
R1
V
R2
t
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Equivalent Series Circuit
R2
V
t
R1
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Symbols - resistor
R1
R1
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Symbols - potentiometer
R4
R4
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Potentiometer Construction
carbon
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10K Potentiometer
Slide Control Linear Taper
10,000 ohms
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10K Potentiometer
Slide Control Linear Taper
1000 ohms
9000 ohms
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10K Potentiometer
3K ohms
7K ohms
28
10K Potentiometer
6K ohms
4K ohms
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10K Potentiometer
9.9K ohms
100 ohms
30
10K Potentiometer
0 ohms
10K ohms
31
10K Potentiometer
0 ohms
10K ohms
10K ohms
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10K Potentiometer
6.7K ohms
3.3K ohms
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10K Potentiometer
5K ohms
5Kohms
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10K Potentiometer
3.3K ohms
6.7Kohms
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10K Potentiometer
0K ohms
10Kohms
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Potentiometer Circuit
50-Ohm Pot.
35 Ohms
12 VDC
How muchCurrent?
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Potentiometer Circuit
50-Ohm Pot.
35 Ohms
I V/R I 12/35 I 0.34 Amps
12 VDC
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Potentiometer Circuit
50-Ohm Pot.
10 Ohms
12 VDC
How muchCurrent?
39
Potentiometer Circuit
50-Ohm Pot.
10 Ohms
I V/R I 12/10 I 1.2 Amps
12 VDC
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Potentiometer CircuitSchematic
R1 50?
12 VDC