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.

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.

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 ...

Solution Summary

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

A circuit consists of two 100 ohm resistors in series. What is the voltage across each resistor when
a. Thecurrent through theresistors is 10 mA?
b. Thecurrent through theresistors is 50 mA?

A 20 volt battery is connected to two resistors that are wired in parallel. The resistor values are 120 Ohms and 60 Ohms.
a. What is thecurrent delivered by the battery?
b. What is thecurrent through the 120 Ohms resistor?
c. What is thecurrent through the 60 Ohms resistor?

Please draw a circuit diagram in which a resistor has a nonzero current flowing through it, but in which thecurrent from the battery is
(a) as small as possible
(b) as large as possible (Without short circuiting the battery)
Using 12.0 - V battery of negligible internal resistance
Four resistors: 100, 30, 20, and 10 o

You have 5 resistors, all of which have different values. Theresistors are 50, 40, 30, 20 and 10 ohms. Which of the following statements are true about combinations of these resistors?
True False if you put all 5 resistors in parallel, the equivalent resistance will be greater than 50 ohms
True False when the resistor

Three resistors having resistances of 1.20ohms , 2.60ohms , and 5.00 ohms are connected in series to a 26.0 V battery that has negligible internal resistance.
1) Find the equivalent resistance of the combination
2) Find thecurrent in through 1.60, 2.50, and 5.00ohms resistors.
3) Find the total current through the ba

Hi. Can someone please walk me through how to do the following problem?
Two resistors are connected in series to a battery with an emf of 12 V. The voltage across the first resistor is 2.2 V and thecurrent through the second resistor is 0.15 A. Find the resistance of the two resistors.
Thank you.

A 12 volt battery and two resistors are wired in series. The resistor values are 80 Ohms and 40 Ohms.
a. What is thecurrent through theresistors?
b. What is the voltage across the 80 ohm resistor?
c. What is the voltage across the 40 ohm resistor?

Part 1
Three resistors, 13.7 Ω, 44.1 Ω, and R, are connected in series with a 18.0 V battery. The total current flowing through the battery is 0.122 A. Calculate the value of resistance R.
Part 2
Calculate the potential difference across R.

A triangular array of resistors is shown in the figure (see attachment). What current will this array draw from a 30.0V battery having negligible internal resistance if we connect it across (a) ab, (b) bc, (c) ac?

You have two resistors with different values. They may be combined either in series or in parallel, and that combination is then connected to a battery. Which of the following statements are true?
(T/F) to minimize the total power coming out of the battery, theresistors should be connected in parallel.
(T/F) to minimize