Plot a graph with V along X axis and I along axis.Take at least six sets of readings by adjusting the rheostat gradually.Record the readings of the ammeter and voltmeter.Adjust the rheostat to get a small deflection in ammeter and voltmeter.Insert the key K and slide the rheostat contact to see whether the ammeter and voltmeter are showing deflections properly.Adjust the rheostat to pass a low current.Determine the zero error and least count of the ammeter and voltmeter and record them.Take care to connect the ammeter and voltmeter with their correct polarity. Make the connections as per circuit diagram. Clean the ends of the connecting wires with sandpaper and make them shiny.Arrange the apparatus as per the circuit diagram.Draw the circuit diagram as shown in figure above.The resistance R of the wire depends on the material of the wire and its dimensions.ĬIRCUIT DIAGRAM Circuit Diagram – Determining Unknown Resistance Ohm’s Law states that the electric current passing through a conductor is directly proportional to the potential difference applied across its ends. AIM To determine the resistance per cm of a given wire by plotting a graph of potential difference versus current.īattery, key, rheostat, voltmeter, ammeter, resistance wire (unknown resistance), connecting wires, meter scale, sandpaper.
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