If all the
batteries are part
of one branch they
can be combined into a single equivalent
battery. Generally, the
batteries will be part
of different branches, and another method
has to be used to analyze the
circuit to find the current in each branch.
Circuits like this
are known as multi-loop
circuits.
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When using batteries, increasing the voltage also increases the current in the circuit. ... As the number of devices placed within one series circuit increases, the resistance also increases. In a parallel circuit, as electrical devices are added the resistance decreases.