Finding the Resistivity of a Wire

... PLANNING Finding the Resistivity of a Wire This is the circuit diagram for the practical part of my investigation. Apparatus Use Range Interval Power Pack Supply power to the circuit 0V - 12V -------------- Leads and Crocodile Clips Connect components in the circuit -------------- -------------- Ammeter Measure current -10A - 10A ±0.01A Voltmeter Measure voltage across the wire -20V - 20V ±0.01V Micrometer Measure the diameter of the wire 25mm ±0.01mm Ruler Measure the length of the wire 0m - 1m ±0.001m Sticky Tape Keep wire straight -------------- ------------- Nichrome Wire Find its resistivity -------------- ------------- Page1 o Current - kept constant at 0.50A by varying voltage supplied by power pack. o Voltage - dependent variable measured by voltmeter. o Diameter of Wire - kept constant by using the same wire for all readings. o Material of Wire - kept constant by using the same wire for all readings. o Length of Wire - independent variable; varied by changing contact points between wire and circuit. First I will cut a strip of the Nichrome wire approximately 1.20 m long and measure its diameter using the micrometer six times: at three evenly spaced points

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