Circuit, voltage, power
Favorites|Homepage
Subscriptions | sitemap
HOME > > Circuit, voltage, power

Circuit, voltage, power

[From: ] [author: ] [Date: 12-07-16] [Hit: ]
I know I have to use the node rule and all that but cant figure it out.Help, please!Thanks!-First, figure out the unknown voltage by using KVL.......
I need help with this problem..

Picture: http://www.webassign.net/hecht/p18-86.gi…

Problem: Solve for the unknown source voltage and the power delivered by the battery on the left of the figure, if VL = 11 V.

?V ; ?W

So I know P =IV so I need the source voltage and then I could find P=(3)(V) but I am not sure how to do that. I know I have to use the node rule and all that but can't figure it out. Help, please! Thanks!

-
First, figure out the unknown voltage by using KVL.
Let the current that flows across the 6 ohm resistor be i
Using KVL,
11V = 6i + 2*3
so i = 5/6 A

The unknown voltage is:
V = (3 - i) + 2*3 = 9 - i = 49/6 V

The power delivered by the left battery is V * I. Here I is nothing but the current flowing through the 6 ohm resistor.
P = 11V * 5/6 = 55/6 W

Ans: 49/6 V, 55/6 W
1
keywords: power,voltage,Circuit,Circuit, voltage, power
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .