In most real-world situations, it is important to design a system so that it can take damage and still deliver the necessary results. An example of this in circuit design is building in redundant power supplies. However, it is very seldom as simple as just adding in another battery. New power sources mean that the overall system must be redesigned in order to handle variances in voltage and current while still remaining operational.
We were given the task of designing a simple circuit which consisted of two voltage supplies and a total of five resistors.
Design Parameters:
We are given that in the outer loop there is a 100 Ohm resistor followed by two 220 Ohm resistors in series. There is a 12V source connected by the positive terminal to the 100 Ohm resistor and a 9V supply connected by its positive resistor to the outside 220 Ohm resistor. The two negative negative terminals are connected to each other and ground. There are two branches connected between the ground consisting of 1000 Ohm resistors, one between the 100 Ohm resistor and the inside 220 Ohm resistor and the other between the two 220 resistors.
Setup:
Results:
We measured the voltage across the 1000 Ohm resistors along with the currents through the batteries and compared these to our predicted values.
Theoretical Value Measured % Error
Current Battery1 -17.5 mA 17.84 mA 1.94
Current Battery2 -1.8 mA 1.57 mA 12.78
Voltage1 10.25 V 10.25 V 10.35 V 1.00
Voltage2 8.6 V 8.6 V 8.76 V 1.86
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