Current in Parallel Circuits
Current in a Parallel Circuit is Additive.
To find total circuit current, add the current of each component. That will
be the total current.
Tip: Think of the whole equaling the sum of its parts. So if you happen to
have the total current of a circuit, and the current of all the components
except one, can you see where the total current minus the current of all the
components except the missing one will produce the current of that missing one?
Neat, eh?
Here is the formula for current total in a series circuit with 4 components:
It= I1 + I2 + I3 + I4
If you know the total CURRENT and all the component currents except one,
then here are formulas for a circuit with 4 components:
I1 = It  I2  I3  I4
I2 = It  I1  I3  I4
I3 = It  I1  I2  I4
I4 = It  I1  I2  I3
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