The product of the resistors facing one will be equal to the product of the other dealing resistro-resistor if the potential difference between c and d is zero. R1 equation. R3 = R2. R4 can be derived by applying Kirchoff’s Law in the circuit. Bridge circuit used to measure the value of an obstacle in a way seeking the current flowing in the galvanometer is zero (because the potential at the ends of the galvanometer as large). So the barriers to the cross product formula applies: R1 R2 R3 = Rx
Wheatstone bridge is an arrangement of electronic components such as resistors and power supply as shown in the following figure:
Figure 4.9 The bridge circuit
1. The bridge circuit is formed by four resistors R1, R2, R3, and R4 are connected in series and in parallel so as to form a special configuration as shown in the following figure.
2. Observe the bridge circuit and the identification of materials and equipment needed for experiments. Then prepare experiments to conduct more in-depth examination associated with the bridge circuit. For that to prepare the materials needed.
3. To facilitate your analysis, select the resistor value as follows: R1 = R2 = 100 Ohm. R3 = 200 Ohm, and R3 (variable resistor) = 0-200 Ohm.
4. Create a series of such pictures.
5. Turn on the circuit by closing switch S.
6. Set the variable resistor R3, what do you get?
7. Does the voltmeter can designate a value of zero volts?
8. Does the voltmeter can appoint the maximum value?
9. When you have finished return all original materials such tools.
10. Report the results of your research, and presented in the classroom.