The series combination of resistors:
§ 1-4 Resistance and Source combination
,Several voltage sources in series may be replaced by
an equivalent voltage source having a voltage equal to
the algebraic sum of the individual sources.
The series combination of voltage sources:
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The parallel combination of current sources:
The parallel current sources may also be combined by
algebraically adding the individual currents,and the order
of the parallel elements may be rearranged as desired.
Example:
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A voltage source in parallel or series with a current
source,
The parallel combination of voltage sources:
Voltage sources in parallel are permissible only when each
has the same terminal voltage at every instant.
The series combination of current sources:
Two current sources may not placed in series unless each has
the same current,including sign,for every instant of time.
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