Resistors

Reminder :
Connecting in series : equivallent resistance R is the sum of resistances : R = r1 + r2 + ...
Connecting in parallel : the equivallent conductance 1/R is the sum of conductances : 1/R = 1/r1 + 1/r2 + ...

We want an equivallent resistance of 30 Ω by connecting two resistors with integral values in parallel.
Give all possibilities for the two resistors values.
Solution

Is it possible to use resistors from the normalized set E12 = {10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82} and 10± n multiples
Solution

Details

 

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