Finding Current and Voltage Questions?

[Paymemoney]

Hi
I have two question i am stuck on can someone give me some hints on how would i start it.
The attachment has the problems i am referring to.
View attachment tut1qns.doc

In Question 1 how would you simplify the resistance so you can get Rab?

In Question 2 i have a problem with what exactly does it mean by Req? Does it ask to simplify the resistance?


P.S

 

[gneill]

Hi
In Question 1 how would you simplify the resistance so you can get Rab?

Pay attention to that sneaky wire going from node c to node f. What does that connection imply about nodes c and f?

In Question 2 i have a problem with what exactly does it mean by Req? Does it ask to simplify the resistance?

Req means equivalent resistance as seen from the point indicated. In this case the bent arrow is meant to imply a vertical slice through the circuit connections at that point. So it looks like they want you to find the total resistance of the whole circuit as seen by the 20V supply.