It is possible to determine the current

through and the voltage across any

particular resistor in a parallel circuit.

This is accomplished by determining the

current through the particular resistor and

then applying Ohm's law to find the voltage

across the particular resistor.

In the diagram above, R1 and R2 are in

series. The current through R1 will be the

same through R2. Since branch A is in

parallel with Et, the voltage across branch A

is equal to 300 volts. The total resistance

of branch A (RA) is 30 ohms. The current

through branch A is found by using Ohm's law,

IA = ERA

RA

= 300 v

30

IA = 10 a