Resistance of a Wire

A. Planning Plan of the method to be employ: - The resistivity of nichrome buttocks be determined using the equating ??=?RA/L Where: R:- Is the resistance of the tele graph in ?ohms and pile be determined using the equation R=V/I where V is voltage in volts and I is electric current in amperes. L:- Is the duration of the nichrome conducting wire used in metres. A:- Is the cross-sectional area of the wire in metres foursquare and can be determined using the equation A= ??d2 where d is the diameter of the wire. If I plot a graph of length on the x-axis against resistance on the y-axis. From the relation R = ? L /A which corresponds to the st. line equation ? y=mx the graph should be a st. line passing through the origin where m is the gradient of the st. line graph and corresponds to ?/A. Since the cross-sectional area of the wire can be found by knowing it´s diameter. Therefore the resistivity of nichrome can be calculated. ? Diagram of the circuit used in this try key of the apparatus used: - 1- Power pack depict of 4V 2-A variable quantity resistor 3-A full scale deflection ammeter with a amount surf of 0-1 A 4-A digital voltmeter with a measuring range of 0-5 V 5-P, Q represents term blocks.

6-Circuit wires 7-PQ=Nichrome wire 8-A meter ruler 9-Michrometer screw-gauge 10-Sellotape elaborate method: - I set up the circuit as shown in the diagram that I have drawn. I started the test by taping a meter ruler mingled with the terminal blocks P, Q so that I could mea trusted 100cm of nichrome wire.I made real that the wire was carefully tightened at both terminals to try to wor k out down the kinks or twists in the wire. ! I then switched on the forcefulness pack... If you want to get a full essay, rig it on our website: BestEssayCheap.com

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