Finding Power using Kirchhoff's rule

[skelder]

Homework Statement

Calculate the power delivered to R1
R1=2.00 Ω, R2=4.00 Ω, R3=4.00 Ω, R4=2.00 Ω, E1=60.0 V and E2=30.0 V.

See current in Attachments:

Homework Equations

P=IV=V^2/R

The Attempt at a Solution

Made R2 and R3 equivalent resistors and then used different loops to solve for current. I end up with a current of 0. HELP!

 

[Zryn]

Can you show your working so we can assist you in finding an answer. Do you know which answers you are supposed to get?

 

[skelder]

I figured it out thanks anyways.

Find the equivalent resistance of R2 and R3. Then use two loops:

I' is the current flowing through the equivalent resistance

1) E1 - R1I1 + ReqI' = 0

2)E2 - R4I4-I'Req = 0

3) I1+I'=I4

sub eqn 3 in 2 and solve for I'

Now sub this in 1 and solve for I1

Now use I1 and R1 to get power

 

[Zryn]

Looks good!

What did you get for the Power?

 

[skelder]

I got 1250 W

 

[Zryn]

Me too!

Just wanted to check the numbers despite the theory being sound, since sometimes crazy things happen between the theory and the practice.