# Resistors - Finding the Current

Not what you're looking for?

Hi. Can someone please help me with the following problem?

I'll try to draw the circuit (with battery and 4 resistors), but I don't know if all the spacing will come out right. The "///" are resistors.

Basically, it's a circuit with a 15-V battery and 4 resistors. First you hit R1, which = 11 ohms. Then there are two paths -- path #1 contains R2=7.5 ohms; path #2 contains 2 resistors in series, R3=6.2 ohms and R4 = 12 ohms. R3 and R4 are in parallel with R3.

R3=6.2 ohms

| -----------------////-----|

| | |

| | |

| / /

15V / R2=7.5 / R4=12 ohms

| / ohms /

| | |

| | |

|-------////----|-----------|

R1=11 ohms

The questions asks us to find the current through each resistor using the rules for series and parallel.

The answers are:

I1 = 0.92 A

I2 = 0.65 A

and I(R3 + R4) = 0.27

But I don't understand why I wouldn't use the equation I1 = V/R1, I2 = V/R2 etc. for these. Can you please explain why I don't use that equation, and also what I should be using here?

The second part of the question asks us to find the current through each resistor using Kirchoff's rules. Can you show me that? I'm still having trouble with Kirchoff.

Thank you.

##### Purchase this Solution

##### Solution Summary

The solution is given with explanations and diagrams and two references.

##### Solution Preview

Hello and thank you for using Brainmass!

The solution is attached below in two files. the files are identical in content, only differ in format. The first is in MS Word XP Format, while the other is in Adobe pdf format. Therefore you can choose the format that is most suitable to you.

Though the pdf file is 326K and the Word document is 649K (lots of graphics).

As to your initial ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### The Moon

Test your knowledge of moon phases and movement.

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

##### Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

##### Basic Physics

This quiz will test your knowledge about basic Physics.