Answers to the questions:

1. What conclusions can you draw from your data reduction?
   From the data reduction, we can conclude:
   1. Ohm's Law is valid, that is, current is proportional to voltage. the graph is a straight line passing through the origin. The slope of the graph is 1/R, the reciprocal of the resistance. The resistance is a constant
   2. Current is inversely proportional to the length of the wire. The graph is also a stright line. As the length of the wire increases, the resitance of the wire increases, which proves the validity of the equation R =rl/A.
   3. Current is proportional to the number of wires, that is, as the cross-sectional area of the wire increases, the resistance of the wire decreases, hence the current increases. The graph is also a straight line. The equation R = rl/A is applicable.
2. Do the experimental points really fall on a straight line in your three plots? Give some discussion.
   Your results depend on your performances both systematic and random errors.
3. If you burnt the wire of the potential meter, what is the possible reason?
   The most possible reason is that you set the initial voltage too high, hence the current starts at a higher value. When you connected the wires in parallel, it resulted in high valued current, which exceeded the wire's load, caused the wire burnt.