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    Ohm's Law Lab Script

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    Desha roberts
    This document outlines an experiment to determine the resistance of a fixed resistor using Ohm's Law. A circuit was constructed using a power supply, resistor, ammeter, and voltmeter. Current and voltage readings were recorded for increasing voltages. The resistance was calculated by determining the gradient of the voltage-current graph plotted from the data. Ohm's Law states that voltage is directly proportional to current, and the experiment validated this relationship for the fixed resistor. Sources of error and precautions taken in the experiment are also described.

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    Ohm's Law Lab Script

    Uploaded by

    Desha roberts
    16 views2 pages
    This document outlines an experiment to determine the resistance of a fixed resistor using Ohm's Law. A circuit was constructed using a power supply, resistor, ammeter, and voltmeter. Current and voltage readings were recorded for increasing voltages. The resistance was calculated by determining the gradient of the voltage-current graph plotted from the data. Ohm's Law states that voltage is directly proportional to current, and the experiment validated this relationship for the fixed resistor. Sources of error and precautions taken in the experiment are also described.

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    Ohm's law Lab Script

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    This document outlines an experiment to determine the resistance of a fixed resistor using Ohm's Law. A circuit was constructed using a power supply, resistor, ammeter, and voltmeter. Current and voltage readings were recorded for increasing voltages. The resistance was calculated by determining the gradient of the voltage-current graph plotted from the data. Ohm's Law states that voltage is directly proportional to current, and the experiment validated this relationship for the fixed resistor. Sources of error and precautions taken in the experiment are also described.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    16 views2 pages

    Ohm's Law Lab Script

    Uploaded by

    Desha roberts
    This document outlines an experiment to determine the resistance of a fixed resistor using Ohm's Law. A circuit was constructed using a power supply, resistor, ammeter, and voltmeter. Current and voltage readings were recorded for increasing voltages. The resistance was calculated by determining the gradient of the voltage-current graph plotted from the data. Ohm's Law states that voltage is directly proportional to current, and the experiment validated this relationship for the fixed resistor. Sources of error and precautions taken in the experiment are also described.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 2

    TITLE: Ohm’s Law

    AIM: To determine the resistance of a fixed resistor

    APPARATUS/MATERIALS: power supply, switch, fixed resistor, voltmeter, ammeter,


    connecting wires, crocodile clips

    DIAGRAM:

    OBSERVATIONS/RESULTS:

    Power Supply, Ammeter reading, I/A Voltmeter Reading, V/V


    V/V
    0 0.2 0
    2 2.1 2.1
    4 3.8 3.9
    6 5.3 6
    8 6.8 8.1
    10 8.6 10.2

    *Graph is drawn under OBSERVATIONS/RESULTS*

    CALCULATION:
     Determine the gradient of the graph. Keep in mind your gradient has units!!!!!!!!!!
     M=
    R=V/I
    R= 1/V/I
    =

    DISCUSSION:
    Ohms law states that for a given conductor kept at constant temperature, the potential
    difference, V, across the conductor is directly proportional to the current, I, flowing in the
    conductor, or V ∝  I at constant temperature Hence, V = I × R (resistance)
    The current of an ammeter stays the same and it has a low resistance, the ammeter must be
    connected in series to which it doesn't affect the current to be measured. So, an ammeter is
    connected in series to measure current. The voltmeter must be connected in parallel because it
    has a high resistance to ensure that it's connection do not alter flow of current in the circuit. Now
    if it was to be connected in series then no current will be there in the circuit due to its high
    resistance. Hence it is connected in parallel to the load across which potential difference is to be
    measured.
    After readings are observed it is recommended that the power supply is switched off
    momentarily, so the resistor remains cool because when they are used, resistors become hot.
    When this occurs, it can damage the resistor and shorten its lifespan. The resistance value can
    shift permanently, its duration can be significantly reduced, or the resistor is completely
    damaged resulting in an open circuit. On drastic occasions the excessive power can even melt or
    catch on fire. Hence, the temperature of the resistor should be kept constant.

    SOURCE(S) OF ERROR:
      Reading error may arise while reading the pointers of ammeter and voltmeter.
     Reverse Polarity switching of terminals which procures a 0 error making the pointer go
    the wrong direction

    PRECAUTION:
     To avoid human error while taking measurement, multiple readings can be taken
     To avoid human error while observing the readings on the ammeter and voltmeter,
    another experimenter can denote their observation

    CONCLUSION:
     The resistance of a fixed resistor was found to be .

    REFLECTION

    In completion of this school-based assessment, caution with laboratory apparatus was reinforced while
    handling the circuit. Proper deduction of readings on analogue scales was also practiced so to be applied
    in the completion of other labs. Possible reasons related to ohms law was also given to link observations
    and interpretation.

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