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A few starting circuit problems

The questions below are due on Wednesday September 11, 2019; 11:59:00 PM.
 
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1) Equivalent resistances

Find the equivalent resistance R_{eq}, as viewed from its port, of each resistor network shown below.

Where resistors are numerical values, enter a numerical values.

Where resistors are symbolic names (parts c-e), enter a symbolic expression for R_{eq} in terms of given resistances. Enter component names and numbers without subscripts; for example R2 is entered as R2.

(a) Enter a numerical value [in \Omega]:

(b) Enter a numerical value [in \Omega]:

(c) Enter a symbolic expression:

(d) Enter a symbolic expression:

(e) Enter a symbolic expression:

(f) Enter a numerical value [in \Omega]: