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Question

Why there is a decrease in resistance when a parallel combination is used?


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Solution

Explanation of resistance decrease:

  1. When 2 resistors are connected in parallel the effective area of the resistor increases.
  2. The resistance of the conductor is always inversely proportional to the area R1A.
  3. Hence when the resistors are in parallel, the area increases, and resistance decreases.

Resistances in parallel combination:

  1. When we have a parallel connection, each device is placed in its own branch. The electric charge has multiple paths to pass through the circuit.
  2. When at a junction charges choose the path with minimum resistance. The charges reroute themselves such that the potential difference across conductors is the same
  3. . If R1 andR2 are two resistance in parallel .The net resultant effective resistance is less than individual resistance Rparallel=R1R2R1+R2R1,R2

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