
#1
Jul308, 03:05 PM

P: 303

CHECK IMAGE,
I guess I do not understand voltage division properly can someone see why this doesnt work. Why is the first one giving the wrong answer..? thanks 



#2
Jul308, 06:10 PM

Mentor
P: 39,599

Yes, you have to combine the two parallel resistors into their equivalent resistance. Why did you ignore the 20 Ohm resistor in your first attempt?




#3
Jul308, 08:42 PM

HW Helper
P: 2,618

It's true that the voltage drop across parallel circuit elements are always the same, but the voltage division principle is not based on that. Rather it's based on the conservation of current though 2 circuit elements in series. You have to find the equivalent resistance for the two elements because the 5 ohms is not in series with the 4 ohms.



Register to reply 
Related Discussions  
Synthetic division or Long division of polynomials?  General Math  6  
S4 helix of voltagegated channels is the voltage sensor of the channel  Biology  1  
GPA of Upper Division & Lower Division courses and M.S degree  Academic Guidance  1  
Division with variables (I think I'd call this double division)  Precalculus Mathematics Homework  5  
COMMON MODE VOLTAGE? Can it be a DC voltage?  Electrical Engineering  3 