Electricity, Magnetism, and Nuclear Science
Electricity powers your home, magnets hold notes to your fridge, and nuclear reactions light the Sun. These three topics are deeply connected, and together they close out the study of physical science. Understanding the basics of electricity, magnetism, and nuclear science answers a broad set of test questions.
This lesson covers electric circuits, magnetism, and nuclear reactions.
Electricity is the flow of electric charge, usually electrons, through a conductor. Magnetism is a force produced by moving charges and magnets. Electricity and magnetism are linked as electromagnetism. Nuclear science studies energy released when atomic nuclei split (fission) or join (fusion).
How do electric circuits work?
Electric current is the flow of charge through a wire, pushed by a voltage and slowed by resistance. These three are connected by Ohm’s law:
[ V = IR ]where (V) is voltage, (I) is current, and (R) is resistance. A complete loop, called a circuit, is needed for current to flow. In a series circuit the parts are in one loop, so if one breaks, all stop. In a parallel circuit the parts are on separate branches, so one can fail while others keep working.
What is magnetism, and how is it related to electricity?
Magnetism is a force that attracts or repels through magnetic poles; opposite poles attract and like poles repel. The deep discovery of physics is that electricity and magnetism are two sides of one force. A moving electric charge creates a magnetic field, which is how an electromagnet works, and a changing magnetic field can push charges to create current, which is how generators make electricity. Together they are called electromagnetism.
| Concept | Key idea |
|---|---|
| Ohm’s law | (V=IR) |
| Electromagnet | Current creates a magnetic field |
| Generator | Changing magnetism creates current |
What is nuclear science?
Nuclear science studies the enormous energy stored in the nucleus of an atom. In fission, a large nucleus splits into smaller ones, releasing energy; this powers nuclear plants. In fusion, small nuclei join into a larger one, releasing even more energy; this is what powers the Sun and stars. Both release far more energy than any chemical reaction, because they change the nucleus itself rather than just rearranging electrons.
Watch: A Short Video Lesson
Miacademy Learning Channel walks through this skill clearly in a few minutes. It is a helpful companion to the reading above:
A routine for electricity and nuclear questions
- For circuits, use Ohm’s law (V=IR) and check for a complete loop.
- Series: one path; parallel: separate branches.
- Remember moving charge makes magnetism, and changing magnetism makes current.
- For magnets, opposite poles attract and like poles repel.
- Fission splits a nucleus; fusion joins nuclei; both release large energy.
Practice questions
- Write Ohm’s law.
- What is electric current?
- In a series circuit, what happens if one part breaks?
- How does an electromagnet produce magnetism?
- What is the difference between fission and fusion?
- True or false: like magnetic poles attract each other.
Answers:
- (V=IR).
- The flow of electric charge (usually electrons) through a conductor.
- The whole circuit stops, because there is only one path.
- An electric current flowing through a wire creates a magnetic field.
- Fission splits a large nucleus; fusion joins small nuclei. Both release energy.
- False. Like poles repel; opposite poles attract.
Where this fits
This lesson builds on electricity and simple circuits and connects energy ideas from energy and simple machines. Light and radiation link to the electromagnetic spectrum. Find all topics on the ASVAB General Science Learning Hub.
Recommended Prep Books
These study guides and practice books help you keep building momentum as you prepare:
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