Im totally stuck on my physics c/w we have to work out the resitivity of graphite. First we did a preliminary which is where we measured both the voltage and current of pencil lead, we did it 3 times to get averages then we worked out the resistance, we made a graph of the length and resistance which incorparated zero errors and then we were asked the find the gradient of it, but i have no idea how to work out the gradient of this graph and my teacher is no help. Please can someone help me!
2007-03-13 23:31:36 · 1 answers · asked by Mark 2 in Science & Mathematics ➔ Physics
Firstly, Resistivity = Resistance x Length / Cross-Sectional Area
To work out a gradient-:
Gradient = Change in y / Change in x
http://www.mathsisfun.com/gradient.html
This explains it really well.
This page even works it out for you-:
http://www.mathsisfun.com/straight-line-graph-calculate.html
2007-03-14 00:04:03 · answer #1 · answered by Doctor Q 6 · 0⤊ 0⤋