Renard series

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/renard-series

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the originator?Colonel Charles Renard, French army engineer, circa 1877
2. What is the international standard?Formally adopted as ISO 3, defining R5, R10, R20, and R40 series
3. What is the Renard series and why do engineers use it?It is a list of special numbers that grow in a steady pattern. Engineers use it to pick standard values for parts like resistors and fuses so everything fits together nicely.
4. How does the Renard series make numbers easier to use?The numbers are spaced by a fixed ratio that comes from a root of 10. This makes it simple to find a close number to any value you need, keeping errors small.

Geometric Progression: A sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.
Preferred Numbers: A standardized set of numerical values chosen to simplify design, manufacturing, and inventory by limiting the number of distinct values used.
ISO 3: An international standard that specifies preferred numbers for industrial use, based on the Renard series.
Relative Error: The ratio of the absolute error to the true value, often expressed as a percentage, indicating the accuracy of an approximation.