Question

voltage divider question

in the circuit linked below, why does v1 = (5/45)*v0 instead of (40/45)*v0 ?

http://imgur.com/CMCcc

Answer 1

To solve voltage division question, you'll need to figure out what happens with the current. Across the series resistors, there is a total voltage of Vo. Now, what does that mean for the current through the resistors?

Now that you know how large the current is that's flowing through the resistors, what can you say on the voltage over just the 5 ohm resistor?