Question

why resistance increases on joining two wires in series and Decreases on joining them in Parallel

Answer 1

In a series combination, the current has to pass through all the resistors connected. There is no option for the current. Hence, resistance becomes high.
In case of parallel combination, the current gets a chance to go through which resistor. Normally in parallel combination, most of the current travels through the resistors that have low resistivity.So there is low resistance in parallel combination.
Summing it up, the current is bound to pass through every resistor in series but in parallel combination the current gets divided.

Answer 2

Answers: As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit decreases and the total current of the circuit increases. Adding more resistors in parallel is equivalent to providing more branches through which charge can flow.

Explanation:

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