The purpose of this experiment was to creat and build an electrical circuit in order to measure and determine the resistance of an unknown resisitor (Rx). This was accomplished by using a Wheatstone bridge circuit, it wass possible to calculate an unknown resistance due to its equation Rx=(R2/R1)R3. It was also possible to relate the length of the first and second resistors to its resistance with the following equation: (R1/R2=l1/l2). Thus the length of each resistor was equal to its resistance. The third known resistance (R3) was the value applied to the resistance box, this being 100 ohm throughout the experiment. By plugging in these values into the equation, it was possible to determine the resistance of an unknown resistor.