How to find the voltage and current of this circuit

[silvercats]

how to find V,I2 and I3 of this.

http://oi52.tinypic.com/10pypw9.jpg

simplified and By putting V=IR
19*8=152
Found the voltage.
But can't find I.

detailed solution expected.
thank you

 

[Redbelly98]

Please note: I am moving this question to "Introductory Physics", since it is more appropriate there.

how to find V,I2 and I3 of this.

http://oi52.tinypic.com/10pypw9.jpg

simplified and By putting V=IR
19*8=152
Found the voltage.
But can't find I.

What is the voltage across the 4-ohm resistor, and therefore across the 20-ohm resistor? That should help you with finding I₂.

detailed solution expected.

Sorry, that is not how this forum works. Please review our forum rules on getting homework help by scrolling down to the section titled Homework Help at our rules page here:
https://www.physicsforums.com/showthread.php?t=414380

 

[silvercats]

What is the voltage across the 4-ohm resistor, and therefore across the 20-ohm resistor? That should help you with finding I2.

4ohm resistor:V=IR
V=8*4
V=32 <<<i think it ok?
/
How am i supposed to find the voltage of 20ohm one without knowing its current(I)?

 

[gneill]

You have the battery voltage and the voltage drop on the 4 Ohm resistor. What does that suggest?

 

[Drohm]

Given are the total current (8A) and values of the resistors R1(4ohms),R2(20ohms), and R3(60ohms).
V=IR where R is the total resistance and R= R2R3/R2+R3 or (20*60)/20+60= 15ohms

The total voltage is 8A*(15+4)ohms = 152V

Now the voltage across R1 is IR1: 8A*4Ohms = 32V so the "balance" is 120V across R2//R3.

So 120V/15ohms=6A and 120V/60ohms=2A.

Does this help?

 

[gneill]

It not only helps, it answers the question without the poster having done any work for himself. Not a good learning experience

The policy here is to provide encouragement, hints, theoretical background, and so forth, so that (hopefully) the querents can work through to, or be guided to, solutions themselves. Just doing the homework for others is frowned upon (it can in fact lead to account cancellation).

Other than that, welcome to Physics Forums, Drohm

 

[silvercats]

Thanks 'Redbelly98' for answering...!

 

[silvercats]

It not only helps, it answers the question without the poster having done any work for himself. Not a good learning experience

Yup I didn't do any work.But using this his example ,I did many other questions like this!

Actually gneill,your hint didn't do a good job.Those hints confuse at all.No offense .Thanks for helping

 

[silvercats]

Does this help?

HELL YEAH! thanks.i was able to do more questions like this using your answer.Keep up the good work.Thanks...

 

[newyorkcity]

detailed solution expected.

lol. why would anyone respond to such an absurd demand?

 

[gneill]

It not only helps, it answers the question without the poster having done any work for himself. Not a good learning experience

Yup I didn't do any work.But using this his example ,I did many other questions like this!

Actually gneill,your hint didn't do a good job.Those hints confuse at all.No offense .Thanks for helping

No offense taken. Let us hope that you have similar templates available for exams.

 

[silvercats]

why would anyone respond to such an absurd demand?

lol isn't this a violation of forum rules?Talking off topic and rant

 

[silvercats]

No offense taken. Let us hope that you have similar templates available for exams.

yeah let's hope so :P

 

[Redbelly98]

lol. why would anyone respond to such an absurd demand?

lol isn't this a violation of forum rules?Talking off topic and rant

At this forum, it's a bigger violation to (A) say you want a detailed solution to a homework problem or (B) provide a detailed homework solution. Did you read the homework help section of our rules yet?