Batteryless radio

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/batteryless-radio

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 power source classification?Categorized by power source: mains-powered (AC grid) or ambient energy-powered (radio waves)
2. What is the historical precedent?Early 'mains radios' eliminated battery dependence by using household electrical outlets
3. How does a crystal radio get its power?A crystal radio uses the tiny energy from radio waves. Its antenna catches the waves and a special diode turns that energy into a small DC power that runs the radio.
4. Why were mains radios called "mains radios"?Mains radios were called that because they were plugged into the AC power grid instead of using batteries. This made them always on and very handy.

Alternating Current (AC): Electric current that periodically reverses direction, typical of household power.
Direct Current (DC): Electric current that flows in only one direction, used by most electronic devices.
Energy Harvesting: The process of capturing small amounts of energy from external sources to power electronic devices.