3)TYPES OF CIRCUITS

SERIES CIRCUIT
Two or more elements form a series circuit when output of one element provides the input for the next element.
In the following diagram, the same current flows through all the elements, and the total voltage is the sum of the tensions at the end of each element.
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To calculate the total resistance of a circuit, we add the resistance values of each load:R1+R2
PARALLEL CIRCUIT
In the parallel circuit, the various components share the same input and output.In other words, the wires from both sides are joined together.In this case, the potential difference is the same of each element, but the current that flows through each branch is different.The equivalent resistance of this type of circuit would be:
                                        1/R=1/R1+1/R2+1/R3
If identical batteries are connected in parallel,the voltage of the circuit will not increase. However, the total consumation of energy will be shared between the batteries, so each one will last longer.

COMBINATION CIRCUIT
A combination circuit has some elements connected in series and other elements connected in parallel.

In this type of circuit, the current remains constant between elements that are connected in series.At the same time, the voltage remains constant between elements are connected in parallel.