Electrical impedance

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/electrical-impedance

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 frequency dependence?Reactance (and thus impedance) is frequency-dependent, unlike pure resistance
2. What is the applications?Crucial for power transfer, signal integrity, RF design, and biomedical sensing
3. Why does impedance matter in AC circuits?Impedance decides how much current flows and how the current’s timing compares to the voltage. It helps engineers design circuits that work well and use power efficiently.
4. What are inductive and capacitive reactance?Inductive reactance comes from inductors that resist changes in current using magnetic fields. Capacitive reactance comes from capacitors that resist changes in voltage using stored electric charge.

Complex Impedance: A complex number representing both the magnitude and phase of opposition to AC current.
Inductive Reactance: Opposition to AC current caused by a magnetic field in an inductor.
Capacitive Reactance: Opposition to AC current caused by charge storage in a capacitor.