Slove the question step by step.

Question

If two resistors R1 and R2 are connected in parallel, the equivalent resistance becomes 𝑅𝑒𝑞 = 𝑅1.𝑅2/𝑅1+𝑅2 . If 𝑅1 = 22.0 Ω ± 1.1 Ω 𝑎𝑛𝑑 𝑅2 = 47.0 ± 4.7 Ω, find the percentage error in the calculation of the equivalent resistance.

Answer 1

The equivalent resistance could be as large as 16.04 or as small as 14.0. The nominal is 15.0 thus the error is +1.04 and - 1.0, approximately ±6.7 % from 15.