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
IT0334
2-12
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