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Physics Lab 2 Ying Yi PhD 1 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 2 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 3 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 !!! 4 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 5 PHYS Lab II @ HCC 2014 Spring How to use a Muiltimeter? http://www.youtube.com/watch?v=bF3OyQ3Hwf U 6 PHYS Lab II @ HCC 2014 Spring Which one measures DC voltage? A C D 7 PHYS Lab II @ HCC 2014 Spring B Where do we plug black jack? A B C D: It depends what you want to measure. 8 PHYS Lab II @ HCC 2014 Spring Is it right to measure resistance this way? YES or NO 9 PHYS Lab II @ HCC 2014 Spring Is this right to measure current? YES or NO 10 PHYS Lab II @ HCC 2014 Spring Which is the correct way to measure current? A 11 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) 12 PHYS Lab II @ HCC 2014 Spring 13 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) 14 PHYS Lab II @ HCC 2014 Spring Select two resistors Two leads from the multimeter: Black ---- COM Red ----- ohms R1 = 51 ohms R2 = 240 ohms 15 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) 16 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 17 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 18 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 19 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) 20 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 21 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 22 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 23 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! 24 PHYS Lab II @ HCC 2014 Spring