Disadvantages of parallel wiring for circuits include that they need more wiring and there are many paths running next to each other. When you add more things to the wiring, the current draws on the same source and goes up.
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There are no inherent disadvantages with a parallel connection, as it does what it's supposed to do. It provides a common voltage to all branches, ensuring that devices connected in those branches operate at their rated power, and the failure of one device doesn't affect any of the others.
It protects the insulated conductors against mechanical and environmental damage.
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There are no disadvantages to the use of parallel circuits in houses. As the rated power of any appliance is dependent upon it operating at its rated voltage, then a parallel connection is the only method of achieving this. Furthermore, in the case of lighting circuits, for example, should one lamp fail, the parallel connection ensures that the remaining lamps will continue to work normally.
if we remove a resistor from the parallel connection the effective resistance value will be increased.
Characteristics of parallel connection.
if you connect the pumps in series, it will add head at the same flow rate. Inversely, in parallel connection, double the flow rate at same head.