ETEC 110 – DC Circuits Lab-series resistance

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New York Institute of Technology, Westbury *

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110

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Electrical Engineering

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Jan 9, 2024

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ETEC 110 – DC Circuits Lab

Objective 1-determaning the resistance of a series of circuits suing the ohmmeter or the application of ohms law 2-calculating the overall resistance of a series circuit and seeing the effect of the magnitude of each series resistor on the total resistance 3-identifaying witch resistors of network are in series. 4-developing skills and confidence with the DMM ohmmeter section. Theory Calculating the resistance of the resistors and being able to identify the effect of magnitude of each resistor in series Part 2 Part 1-two series resistors R1 measure=216.3 Ω R2 measure=98.4 Ω Calculating the total resistance using measurement resistance values. Rt=314.7 Ω Measurement with the ohmmeter of the dmm Rt=314.5 Calculating the magnitude of the percentage difference Equation =

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R1 measure=98.4 R2 measure=216.3 R3 measure=333.2 Calculating the total resistance with the measure resistor values. Rt=637.9 Total resistance with the ohmmeter section with the dmm Rt=643 Ω The magnitude of the percent difference usage | 643-647.9 | %difference= ------------------- x100% %difference:0.76% | 647.9 |

The current recorded after applying 10v I=15.48mA Total resistance reding using the ammeter and 10v Total resistance R=V/I R=10v/15.48k Ω Rt=0.65k Ω Rt=650 Ω Total Difference between part 1 and part 2 The difference between 643 Ω from part 1 and 650 Ω from part 2 there is a 7 Ω difference

Part 3-Equal series resistors R1 measure=98.4 Ω R2 measure=97.8 Ω R3 measure=98.6 Ω Total resistance Rt=300 Ω Total resistance with ohmmeter with dmm Rt=295 Ω Calculated magnitude of the percent difference | 300-295 | %difference= --------------- x100% %difference:1.67% | 300 | Is the percentage difference sufficiently small to permit use of part 3 nominal value on an approximate basis? It still falls under the tolerance rate Calculated value using the resistors? 98.4+98.6+97.8=294.8 Ω Rt=294.8 Ω What is the magnitude percent difference? | 295-294.8 | %difference= --------------- x100% %difference:0.07%

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| 295 | Part 4-A Composite R1 measure=216.3 Ω R2 measure=98.4 Ω R3 measure=97.8 R4 measure=986 Ω R5 measure=333.2 Ω Calculated resistance with measure values Rt=1741.7 Ω Measure resistance with dmm Rt=1728 Ω Percentage difference with calculated measure values | 1731.7-1728 | %difference= --------------- x100% %difference:0.21% | 1731 |

Calculated total difference R=V/I R=10v/5.77x10 ^-3 Rt=1733.1 Ω I=5.77 | 1733.1-1728 | %difference= --------------- x100% %difference:0.3% | 1733.1 |

Part 5-Different Levels of Resistance R2 measure=0.098k Ω R2 measure=0.986k Ω R3 measure=98.2k Ω Calculated resistance of the circuit Rt=0.993m Ω The ohmmeter of the dmm Rt=0.981m Ω Calculated magnitude difference | 0.984-0.993 | %difference= --------------- x100% %difference:0.9% | 0.993 | Calculated total resistance with measure values Rt=0.983

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Calculated % difference | 0.984-0.983 | %difference= --------------- x100% %difference:0.1% | 0.984 | The total resistance using measure values with both r1 and r2 ignore Rt=0.982 Ω Magnitude of percent difference between r1 and rt=0.981m Ω | 0.981-0.982 | %difference= --------------- x100% %difference:0.2% | 0.984 | I=V/R .31mA=10/x

I=10/.983M Ω I=.31mA Rt=0.983M Ω Problems Witch resistors are in series? Resistors R5 and R6 are in series Conclusion We learn to calculate circuits in series and identify their magnitude, we also develop skills with the dmm and the ammeter determine the circuits resistance and the effect of magnitude.