# 1Z0-931 Autonomous Database

Lab #24

Approximating Ideal Voltage

and Current Sources

Introduction:

To construct approximate constant voltage and constant current sources.

Theories:

VL = (RL/(RL + RS))(VS)
IL = (RS/(Rs + RL))(IS)

Results:

RS = 1 kΩ
VS = 10 V
IS = 10 mA

Table 24-1 Calculated Data

 Approximate Constant Voltage Source RL (kΩ) 10 17 22 33 46 VL (V) 9.09 9.44 9.57 9.71 9.79 IL (mA) 0.91 0.56 0.43 0.29 0.21

Table 24-2 Calculated Data

 Approximate Constant Current Source RL (Ω) 18 33 47 68 100 VL (V) 0.18 0.32 0.45 0.64 0.91 IL (mA) 9.82 9.68 9.55 9.42 9.1

Table 24-3 Measured Data

 Approximate Constant Voltage Source RL (kΩ) 10 17 22 33 46 VL (V) 9.07 9.47 9.54 9.69 9.8 IL (mA) 0.91 0.56 0.43 0.29 0.21

Table 24-4 Measured Data

 Approximate Constant Current Source RL (Ω) 18 33 47 68 100 VL (V) 0.174 0.31 0.45 0.611 0.899 IL (mA) 9.67 9.89 9.57 8.98 8.99

Laboratory Questions:

1. (a) RL >> RS
2. (a) RL << RS
3. (a) true
4. (a) true
5. For an approximate constant voltage source behavior, as RL increases, the load voltage remains relatively constant to the VS while the current drops. For an approximate constant current sources behavior, as RL increases, the load current remains relatively the constant to the IS while the voltage drops.

Conclusion:

Concluded from this lab was that for a constant voltage source, the load resistance must be greater than the source resistance in order for the load voltage to remain close towards the voltage source and the current to drop.  In a constant current source, the load resistance must be less than the source resistance in order for the load current to remain close towards the current source and the voltage to drop.

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