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question

If RR is the total resistance of three resistors, connected in parallel, with resistances R1,R2,R3R_1, R_2, R_3, then 1R=1R1+1R2+1R3 \frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3} If the resistances are measured in ohms as R1=25ΩR_1=25 \Omega, R2=40ΩR_2=40 \Omega, and R3=50ΩR_3=50 \Omega, with a possible error of 0.5%0.5 \% in each case, estimate the maximum error in the calculated value of RR.
Plain-text mathematical notation (without MathML)
 If R is the total resistance of three resistors, connected in parallel, with resistances R₁,R₂,R₃, then
(1)/(R)=(1)/(R₁)+(1)/(R₂)+(1)/(R₃)
If the resistances are measured in ohms as R₁=25Ω, R₂=40Ω, and R₃=50Ω, with a possible error of 0.5% in each case, estimate the maximum error in the calculated value of R.
Original LaTeX notation
 If $R$ is the total resistance of three resistors, connected in parallel, with resistances $R_1, R_2, R_3$, then
$$
\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}
$$
If the resistances are measured in ohms as $R_1=25 \Omega$, $R_2=40 \Omega$, and $R_3=50 \Omega$, with a possible error of $0.5 \%$ in each case, estimate the maximum error in the calculated value of $R$.

category

math

options

  1. $\frac{1}{20}$ $\Omega$
  2. $\frac{1}{10}$ $\Omega$
  3. $\frac{1}{14}$ $\Omega$
  4. $\frac{1}{25}$ $\Omega$
  5. $\frac{1}{15}$ $\Omega$
  6. $\frac{1}{12}$ $\Omega$
  7. $\frac{1}{22}$ $\Omega$
  8. $\frac{1}{17}$ $\Omega$
  9. $\frac{1}{30}$ $\Omega$
  10. $\frac{1}{18}$ $\Omega$

src

scibench-calculus

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