Unloaded and loaded output voltages problem

Discussion in 'Homework Help' started by metelskiy, Oct 24, 2010.

  1. metelskiy

    Thread Starter Member

    Oct 22, 2010
    66
    3
    Here i have another problem i need help with:
    A voltage divider consists of two 56k resistors and a 15V source. Calculate the unloaded output voltage taken across one of the 56k resistors. What will the output voltage be if a load resistor of 1M is connected across the output?
    First i drew a schematic:
    Prob 13_1.png
    And i figured out that if there are two same value resistors, the voltage across one of resistors will be 15V/2=7.5V

    But i don't really understand what they mean about a load resistor of 1M connected across output?
    Will it look like this?:
    Prob 13_2.png
     
  2. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    Your answer to the first part is correct.

    As for the second part, typically, we draw the load (1MΩ resistor) to actually begin from the wire that stands out (the Vout terminal) and end after the last resistance. But what you did is correct too, electricaly.

    Combine the two parallel resistors and find the new value of Vout.
     
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