Homework Help: Circuit Help (Parallel, finding IR1, VR1, etc )

1. Nov 21, 2004

BigDanT

2. Nov 21, 2004

stunner5000pt

go in loops aroun the circuit and figure it out

the least you can do is show us you attempted it in the least

3. Nov 21, 2004

BigDanT

I dont understand how to find the Vr and Ir.

Im in this electricity class in highschool and the only thing I can almost get out of this is the Rt.

I am so confused and I have to get this done in about 30 mins...

4. Nov 21, 2004

Sirus

What equations have you been given for these things?

5. Nov 21, 2004

BigDanT

Nothing, I just have to find the blanks...

My teacher isn't bad he just doesnt teach the way he should...

6. Nov 21, 2004

stunner5000pt

For the first one

for R1 and R2 find the equivalent resistance of R1 and R2 and R4 and R5

now that you have three resistors in series find the equivalent resistance of the 3 resistors in series

now find the current thorugh all of them

now that you ahev current through all of them you can figure out the I R3 part

for the resistors R1 and R2 what can be said about the voltage and current across them? Use this property to figure out the IR values across each of them Similarly for R4 and R5

once you have all the values for current you can figure out the voltages across each resistor

7. Nov 21, 2004

BigDanT

For the first one... Equivalent of R1 and R2 is 500ohms, and R4 and R5 would be 2.8k ohms... right?

The Rt would 4.8E3?

Im not sure how to find the current without voltage... And if your wondering how Im getting these answers Im using

1
______
1 1
_ + _
R1 R2

method...

Am I right so far?