Voltage DIviders

Objective: To learn the function of an unregulated power supply and the Thevenin Equivalent circuit.

Procedure:

Calculate the maximum and minimum values possible for Req.

 Ibus,max = 15mA

Ibus, min = 6mA

Config         REQ                 Vbus                Ibus                 Pload

1                  1kOhm             6.33V              5.88mA           37.22mW       

2                  800Ohm           6.17V              11.24mA         69.35mW      

3                  330Ohm           6.05V              15.21mA         68.87mW       

Questions

•  Power for each configuration
• P1 = (6.33*0.00588) = 0.0372 W
• P2 = (6.17*0.01124) = 0.0694 W
• P3 = (6.05*0.01521) = 0.0689 W

•  Load voltage variation: 1-6.33/6 = +5.5% 
•  Load voltage variation: 1-6.05/6 = +0.8%
• The difference is caused by the unregulated power supply.
• The voltage would not change because it is connected in parallel.