Trouble with circuit calculations

AI Thread Summary
The discussion revolves around difficulties with circuit calculations, specifically in completing a table related to a provided circuit diagram. Key equations mentioned include Ohm's Law and Kirchhoff's Laws for both series and parallel circuits. A suggestion is made to simplify the circuit by combining resistors R2 and R3 into a single equivalent resistor, R4. This approach aims to facilitate the calculation of current through R1 and R4. Participants are encouraged to apply these principles to determine voltage drops and currents in the circuit.
stu12345
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Homework Statement


I uploaded a picture of the circuit diagram I'm using. Basically I'm having trouble with filling out the rest of the table.

Homework Equations



Ohm's law:
V=IR
series circuit: R(eq)= R1 + R2 + R3...
parallel circuit: 1/R(eq)=1/R1 + 1/R2 + 1/R3 ...

Kirchhoff's Law:

series circuit: the source current equals the current through each load.
series circuit: the source voltage equals the sum of the voltages across each of the loads

parallel circiut: the source current equals the sum of the currents through the loads.
parallel circuit: the source voltage equals the voltage across each load.

The Attempt at a Solution



The attempt of the solution can be found in the picture I uploaded. Any help is much appreciated.

Please I really need help.
 

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You've calculated the current through R1, so what does Ohm's law tell you about the voltage drop across R1?

[Edit: Oh, and by the way, welcome to Physics Forums!]
 
Last edited:
It may help you to think of the parallel combination of R2 and R3 as a single 6 ohm resistor, R4. Then, you would have an equivalent circuit that is purely series-connected.

What, then, is the current through R1 and R4?
 

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