I am given a graph (Potential difference (voltage) vs Current (A)) for a resistor. It asks me to use the graph to determine the best value for the resistance. Does this just mean the smallest value I get using R=V/I ?
im assuming the best resistence would be the smallest number.
2007-04-22 18:05:22 · 3 answers · asked by spiffy_mcbang13 1 in Science & Mathematics ➔ Physics
would the value of my slope be in ohms?
for example i got value 0.83= 5/6
so 5/6 ohms?
2007-04-22 18:22:23 · update #1
you want to know who's fu cking teaching it
a goddamn corrospondants book is what
i have no help whatsoever except a stupid physics textbook
2007-04-22 18:31:35 · update #2
The graph should be a straight line and the best value of resistance is the slope of the line. If the graph is nonlinear, use Method of Least Squares to find a best value for R.
2007-04-22 18:14:23 · answer #1 · answered by Helmut 7 · 0⤊ 0⤋
I really wonder who the hell is trying to teach electricity out there. Your graph, I assume, is a straight line, or fairly straight, and it's on a pair of axes, voltage vs. current. If you look at a couple of the points on this graph, you'll probably find that the ratios of voltage to current is the same, or very close. The resistance of your resistor is the slope of this line, or the reciprocal of the slope; depending on how the axes were set up. What your teacher was trying to get you to do was to figure out the slope of the line as accurately as you can, hence the term 'best' value.
2007-04-23 01:19:52 · answer #2 · answered by 2n2222 6 · 1⤊ 0⤋
I do not see any reason for using abusive language.
Best resistance - What does it mean? I believe it is the range in which it is linear. In that case the answer written by helmut is perfect.
If the graph is linear there is nothing to choose from. The resistance value is fixed.
2007-04-23 03:23:20 · answer #3 · answered by dipakrashmi 4 · 0⤊ 1⤋