Electrometer

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/electrometer

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 measures?Electric charge and electrical potential difference
2. What is the minimum detectable current?1 femtoampere (10^-15 amperes)
3. How does an electrometer detect such small charges?It uses special parts like guard rings and low‑noise amplifiers to keep the measurement clean, and modern versions use vacuum tubes or tiny semiconductor chips to get super accurate readings.
4. Why do scientists need an electrometer?Because it can measure currents as small as one quadrillionth of an ampere, which is important for studying tiny electrical signals in science, medicine, and the environment.

Electric Charge: A fundamental property of matter that dictates its interaction with electromagnetic fields, existing in positive and negative forms.
Potential Difference: The work required per unit charge to move a charge between two points in an electric field; commonly referred to as voltage.
Femtoampere: A unit of electric current equal to 10^-15 amperes, representing an exceedingly small flow of charge.
Input Impedance: The opposition to current flow presented by the input terminal of an electrical circuit or instrument, critical for high-sensitivity measurements.