Ampere

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/ampere

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 SI base unit?The fundamental unit of electric current in the International System of Units
2. What is the named for?André-Marie Ampère (1775–1836), a French mathematician and physicist
3. How is an ampere measured?We count how many coulombs of charge cross a spot each second. That rate is called the electric current and is measured in amperes.
4. Why did the definition of ampere change in 2019?In 2019 the ampere was redefined to use a fixed value of the elementary charge, a tiny particle that carries electric charge. This makes the measurement more stable and accurate because it relies on a constant of nature.

Electric Current: The directed flow of electric charge, measured in Amperes (A).
Coulomb: The SI unit of electric charge, equal to the charge of approximately 6.24 x 10^18 electrons.
Electromagnetism: The branch of physics concerned with the relationship between electricity and magnetism.
Elementary Charge: The magnitude of the electric charge of a single electron or proton, a fundamental constant.