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Example from Physics, 19.3 Parallel Circuits
Without doing any calculation, what is the equivalent resistance of three identical resistors R in parallel?
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Three identical resistors R in parallel make three identical paths through which the current can flow. Thus, it is three times easier for the current to flow through these resistors than to flow through a single one of them.
If it is three times easier to flow through three identical resistors R than to flow through a single one of them, the equivalent resistance must be three times less: R/3.
How did it go?