Removing Resistors for Same Output Voltage

AI Thread Summary
To maintain an output voltage of 4V while removing resistors, the analysis indicates that removing resistor Z is feasible without altering the voltage across the remaining components. The calculated EMF of the cell is 6V, and combining resistors X and Y results in a total resistance of 3000 ohms. To achieve the desired output, the current must be adjusted from 2mA to 1.33mA. This adjustment confirms that removing resistor Z will not affect the output voltage. Therefore, the solution suggests that Z can be safely removed.
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Homework Statement


Provided that the output voltage is 4V, which one or more resistors can be removed to get the same output voltage.


Homework Equations


V=IR


The Attempt at a Solution


Im not sure if any working out is necessary here or not
 

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From the given data, find the emf of the cell.
To get the same output, what to do with X and Z so that the current in Y is 2 mA ?
 
Think about it this way: If you combined X and Y in series, you'd have two parallel resistors. If you removed one of those parallel resistors(Z!), the voltage across and the current through the other parallel resistor does not change.
 
okay EMF I calculated to be 6V, and then I combined X and Y to make another 3000ohm resistor and because I want output to be 4V, then that would mean current has to change from 2mA to 1.33mA correct? which means i can remove Resistor Z. Is that right I am not sure
 
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