7. Construct the Wheatstone bridge in Figure 2.4. Use a 9 V source and R,-50 k-ohm, R-40k-ohm, a resistance box and a third resistor for Rx. Measure the value of Rx using the ohmmeter. 8. Connect a voltmeter at the output of the bridge. Adjust the resistance box to balance the bridge. Record the value of the box resistance. Figure 2.4. Wheatstone Bridge Arrangement. E. Wheatstone Bridge 8. Calculate from the measurements the value of resistor Rx. Compare it with its rated value. R,