Find the currents through and the potential difference across each resistor in t

Question

Find the currents through and the potential difference across each resistor in the circuit shown on the diagram (Figure 1) . Use the following values: EMF = 12.0V , R1 = 15.0, R2 = 45.0, R3 = 20.0, and R4 = 25.0.

Find the following currents.

Find the following potential differences.

I cannot, for the life of me, figure this out.

Find the currents through and the potential difference across each resistor in the circuit shown on the diagram (Figure 1) . Use the following values: EMF = 12.0V , R1 = 15.0, R2 = 45.0, R3 = 20.0, and R4 = 25.0.

Explanation / Answer

R3+R4 = 45 = r
1/(1/r)+(1/45)) = 45/2 = 22.5 = r'
Requi = 22.5+15 = 37.5
I = 12/37.5 = 0.32A
I1 = 0.32A, V1 = I1R1 = 4.8V
I2 = 0.32/2 = 0.16A, V2 = I2R2 = 7.2V
I3 = 0.32/2 = 0.16A, V3 = I3R3 = 3.2V
I4 = 0.32/2 = 0.16A, V4 = I4R4 = 4.0V   

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