Question

Two resistances R1 = 200 plus minus 3ohm and r 2 is equal to 200 plus minus 4 ohm are connected in series then what is the equivalent resistance with error limit​

Answer 1

Explanation:

Let's do this brute force style.

Worst case errors are when both resistors are maximum, and when both are minimum. The center resistance is 100//200 which is 66.66667 ohms.

103//204

Rt = 1/(1/103 + 1/204) = 68.44300 ohms which is 1.77633 or 2.66%

97//196

Rt = 1/(1/97 + 1/196) = 64.88737 ohms which is -1.77930 ohms or -2.67%

As you can see, it isn't -quite- symmetrical, but for these numbers, very close.