Download Lab I Introduction: How to use multimeter

Physics Lab 2
Ying Yi PhD
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PHYS Lab II @ HCC 2014 Spring
Course outline
 Lab 1: Introduction
 Lab 2: Electric Field
 Lab 3: Ohm’s Law
 Lab 4: RC circuit
 Lab 5: RL circuit
 Lab 6: Focal length of Thin Lenses
 Lab 7: Diffraction Grating
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PHYS Lab II @ HCC 2014 Spring
PHYS 1108 Lab Report
 1. Title of the experiment
 Such as Electron Beam in B Field
 Not just the No. --- Lab 1
 2. Introduction
 Theoretical background, find the link from the web, or textbook.
 3. Equipment and Material
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PHYS Lab II @ HCC 2014 Spring
 4. Procedure
 Photo of set up
 5. Data --- Table/Graph
 Make sure including the TITLE & UNIT
 6. Calculation
 Unit, unit, unit !!!
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PHYS Lab II @ HCC 2014 Spring
 7. Error Analysis
 Error% = abs ( Valuecal –Valueexp )/Valuecal
 8. Conclusion
 Including the source of error
 Lab Report must be typed, due the following Friday
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PHYS Lab II @ HCC 2014 Spring
How to use a Muiltimeter?
http://www.youtube.com/watch?v=bF3OyQ3Hwf
U
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PHYS Lab II @ HCC 2014 Spring
Which one measures DC voltage?
A
C
D
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PHYS Lab II @ HCC 2014 Spring
B
Where do we plug black jack?
A B C
D: It depends what you want to measure.
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PHYS Lab II @ HCC 2014 Spring
Is it right to measure resistance this way?
YES or NO
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PHYS Lab II @ HCC 2014 Spring
Is this right to measure current?
YES or NO
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PHYS Lab II @ HCC 2014 Spring
Which is the correct way to measure current?
A
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PHYS Lab II @ HCC 2014 Spring
B
To do list
 Select two resistors(51 Ohms & 240 Ohms)
 Make a series Circuit(Measure I, V, Ω for each
resistance and equivalent resistance to see if
Re=R1+R2; Ve=V1+V2; Ie=I1=I2)
 Make a parallel circuit(Measure I, V, Ω for each
resistor and equivalent resistance to see if
1/Re=1/R1+1/R2; Ve=V1=V2; Ie=I1+I2)
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PHYS Lab II @ HCC 2014 Spring
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R1
R2
R1+R2
Re
%
I1
I2
(I1+I2)/2
Ie
%
V1
V2
V1+V2
Ve
%
R1
R2
Re
%
I1
I2
I1+I2
Ie
%
V1
V2
(V1+V2)/2
Ve
%
PHYS Lab II @ HCC 2014 Spring
𝑹𝟏 𝑹𝟐
𝑹𝟏 + 𝑹𝟐
To do list
 Select two resistors(51 Ohms & 240 Ohms)
 Make a series Circuit(Measure I, V, Ω for each
resistance and equivalent resistance to see if
Re=R1+R2; Ve=V1+V2; Ie=I1=I2)
 Make a parallel circuit(Measure I, V, Ω for each
resistor and equivalent resistance to see if
1/Re=1/R1+1/R2; Ve=V1=V2; Ie=I1+I2)
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PHYS Lab II @ HCC 2014 Spring
Select two resistors
 Two leads from the multimeter:
 Black ---- COM
 Red ----- ohms
 R1 = 51 ohms
 R2 = 240 ohms
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PHYS Lab II @ HCC 2014 Spring
To do list
 Select two resistors(51 Ohms & 240 Ohms)
 Make a series Circuit(Measure I, V, Ω for each
resistance and equivalent resistance to see if
Re=R1+R2; Ve=V1+V2; Ie=I1=I2)
 Make a parallel circuit(Measure I, V, Ω for each
resistor and equivalent resistance to see if
1/Re=1/R1+1/R2; Ve=V1=V2; Ie=I1+I2)
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PHYS Lab II @ HCC 2014 Spring
Series Connection – only one ends
connected – no leaking
R1
51 ohms
V
5v
Measure to see: Re = R1 + R2, Ve = V1 + V2
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PHYS Lab II @ HCC 2014 Spring
R2
240 ohms
Series Connection – Voltage Measurement
R1
51 ohms
Ve
5v
V1
V2
Measure to see: Re = R1 + R2, Ve = V1 + V2
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PHYS Lab II @ HCC 2014 Spring
R2
240 ohms
Series Circuit – Current Measurement
Break the circuit, multimeter connects in series with resistor
R1
51 ohms
I1
V
5v
R2
240 ohms
I2
Measure to see: Re = R1 + R2, V = V1 + V2, Ie = I1 = I2
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PHYS Lab II @ HCC 2014 Spring
To do list
 Select two resistors(51 Ohms & 240 Ohms)
 Make a series Circuit(Measure I, V, Ω for each
resistance and equivalent resistance to see if
Re=R1+R2; Ve=V1+V2; Ie=I1=I2)
 Make a parallel circuit(Measure I, V, Ω for each
resistor and equivalent resistance to see if
1/Re=1/R1+1/R2; Ve=V1=V2; Ie=I1+I2)
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PHYS Lab II @ HCC 2014 Spring
Parallel Connection – two ends connected
V
5v
R1
51 ohm
Measure to check: Ve = V1 = V2, 1/Re = 1/R1 + 1/R2
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PHYS Lab II @ HCC 2014 Spring
R2
240 ohm
Parallel Connection--- Voltage Measurement
V
V
5v e
V1
R1
51 ohm
Measure to check: Ve = V1 = V2, 1/Rt = 1/R1 + 1/R2
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PHYS Lab II @ HCC 2014 Spring
V2
R2
240 ohm
Parallel Connection – Current I Measurement
R1
51 ohm
V
5v
Ie
R2
240 ohm
I1
Measure Current I, Break the Circuit first, then meter connect to the two
BREAKING ENDS
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PHYS Lab II @ HCC 2014 Spring
I2
Think before you do!
Don’t turn on the power before you ask me to check your
circuit!
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PHYS Lab II @ HCC 2014 Spring