I know that according to Ohm's Law that the voltage is directly proportional to the current in a resistor. Upon examing my graph that I have calculated in class, a resistor follows Ohm's Law because the slope was a straight line. The part I am confused about is why would the slope be equal to the resistance value? All I can think of is that since the slope increases when the voltage and current increases, then the resistance value increases as well if the resistance value is equal to the voltage/current. Is this correct? Also, would the age of a reisistor have any affect on calculating my data?