Resistance of a Wire

A. Planning Plan of the method to be used: - The resistivity of nichrome can be determined using the equation ??=?RA/L Where: R:- Is the resistance of the wire in ?"ohms" and can be determined using the equation R=V/I where "V" is voltage in volts and "I" is current in amperes. L:- Is the length of the nichrome wire used in metres. A:- Is the cross-sectional area of the …

…I found that these lengths gave accurate results and that 8 readings was sufficient enough for me to plot a st. line graph and draw a good line of best fit through the points. Micrometer screw-gauge: - I decided to measure the diameter of the wire at 3 different positions on the wire. I then calculated the average diameter from the 3 measurements taken to enable me to measure the diameter of the wire as accurately as possible.