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Slope=?

What does the slope of an inverse resistance vs. current graph tell you?

Slope=?

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Here's what I had to do for my lab:

1: Construct a circuit where I connect a clip onto a wire that allows electricity to flow. Move the clip down the meter stick until you reach 100cm. Result: The farther I moved the clip down the wire the dimmer my light bulb got. The power source was a battery.

2: Measure and record the voltage of the circuit across the battery - this needs to only to be done once. Result: The voltage stayed the same (I do not know if that is correct).

3: Instert an ammeter and measure and record in a table the corresponding current (I) at each position (l).

4: Predict the Resistance (R) at each position.

5: Construct the following:

A) Length (l) vs Resistance (R)

B) Inverse Resistance (1/R) vs Current (I)

My graphs looked like the following: (If anybody has any recommendations on where to create graphs PLEASE tell me, this site isn't too great.)

A = http://www.chartgo.com/share.do?id=d886b9a8aa

B = http://www.chartgo.com/share.do?id=94f8b0fdaa