(Solved): The Wheatstone Bridge combines both voltage and current divider circuits and allows for the accurat ...

The Wheatstone Bridge combines both voltage and current divider circuits and allows for the accurate measurement of resistance. It does this using a circuit, as shown in Figure 2-3, of the unknown resistor and three known resistor values (including one variable resistor), and an ammeter to measure the current between the terminals \( \mathrm{A} \) and \( \mathrm{B} \). As seen in Figure 2-3, the two series branches each act as a voltage divider, while the two branches together make a current divider. Figure 2-3: Wheatstone bridge The goal is to adjust the variable resistor such that the current through the ammeter connected between \( A \) and \( B \) shows zero at which point a simple calculation will provide the resistance value of the unknown resistor. Bridge circuit is balanced when the Ratio of \( R 1 \) and \( R 3 \) is equal to that of \( R 2 \) and \( R 4 \). If there is a short circuit placed between \( \mathrm{AB} \) of the Wheatstone Bridge shown in Figure 2-3, derive the formula to find the current across the terminals \( \mathrm{AB} \) and enter this in the space below. Then calculate the voltages and currents in each component and enter them in Table 2-4. Use MultiSim to simulate the circuit in Figure 2-3.(open circuit voltage and short circuit current; while open circuit means between points A and B is not connected and short circuit meaning between A \&B is connected) and to determine the various currents and voltages as indicated in the Table 2-4. Enter these in Table \( 2-4 \) under the 'simulated' columns.