If a network of linear resistors contains more than one source of
e.m.f.,
the current flowing at any point is the algebraic sum of the
currents that would flow at that point, if each source was considered
separately, with all other sources replaced at that time by
resistances equal to their internal resistances.
Example 6 Find the currents in each branch of the circuit in Figure
4.12 using the superposition theorem. This circuit is identical to
Figure 4.6.
Figure
4.12
First remove the 2-V source an
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