Transcription of Experiment 15: Ohm’s Law
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Experiment 15: Ohm’s Law
Experiment 15: Ohm s LawFigure : Simple Series CircuitEQUIPMENTU niversal Circuit BoardPower Supply(2) DMM s150 Resistor (R1)330 Resistor (R2)560 Resistor (R3)Miniature Light Bulb and Socket (R4)(1) Jumper(6) Wire LeadsFigure : Schematic: Simple Series Circuit7980 Experiment 15: Ohm s LawAdvance ReadingText:Ohm s Law, voltage, resistance, Manual: Appendix B,Appendix C-DMMO bjectiveThe objective of this lab is to determine the resistanceof several resistors by applying Ohm s Law. Studentswill also be introduced to the resistor color code andrefresh their graphing s Law states that the current,I, that flows in acircuit is directly proportional to the voltage,V, acrossthe circuit and inversely proportional to the resistance,R, of the circuit:I=VR( )In this Experiment , the current flowing through a resis-tor will be measured as the voltage across the resistoris varied. From the graph of this data, the resistance isdetermined for Ohmic resistors (Ri,i= 1, 2, 3). Non-Ohmic resistors (R4, light bulb) do not obey Ohm are connected in seriesso that thecur-rent flows throughthem.
Ammeters are connected in series so that the cur-rent flows through them. The ideal ammeter has a re-sistance of zero so that it has no e↵ect on the circuit. Real ammeters have some internal resistance. Voltmeters are connected in parallel to resistive elements in the circuit so that they measure the poten-
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