Exploring Our World: Scientific Inquiry and Discovery · 4th Class

Active learning ideas

Electromagnets: Temporary Magnets

Active learning works best for temporary electromagnets because students need to see the immediate connection between electric current and magnetic fields. When they build and test their own designs, the abstract concept becomes visible through observable results like paperclips lifting or dropping instantly.

• NCCA Curriculum Specifications
• NCCA: Primary - Energy and Forces
• NCCA: Primary - Magnetism and Electricity

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Project-Based Learning
• 35 min · Small Groups

Build-and-Test: Simple Electromagnets

Provide batteries, wire, nails, and paperclips. Students wrap 20 coils around a nail, connect to battery, and count lifted paperclips. They record results, then rewind with 40 coils to compare strength. Discuss fair testing.

Design an electromagnet using common classroom materials.

Facilitation Tip

During Build-and-Test, circulate to ensure students wrap coils tightly around the nail without overlapping to avoid short circuits.

What to look for

Give students a small nail, wire, and battery. Ask them to build a working electromagnet and pick up at least 3 paperclips. On their exit ticket, they should draw their setup and write one sentence explaining why it works.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Activity 02

• Project-Based Learning
• 45 min · Small Groups

Strength Challenge: Vary the Variables

Groups test one change at a time: more coils, extra battery, different core (nail vs screw). Lift paperclips, tally successes, and graph results on chart paper. Share findings in whole-class debrief.

Explain how electricity can create a temporary magnetic field.

Facilitation Tip

During Strength Challenge, ask students to record their coil counts and battery setups on a shared chart to track patterns.

What to look for

Ask students: 'Imagine you have an electromagnet that can pick up 5 paperclips. How could you make it pick up 10 paperclips? What steps would you take, and why?' Listen for explanations involving more coils or stronger batteries.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Activity 03

• Project-Based Learning
• 25 min · Pairs

Polarity Flip: Direction Matters

Build electromagnets, test which end attracts a magnet. Reverse battery wires, observe pole switch, and label north/south. Draw before-and-after diagrams to explain the change.

Compare the properties of permanent magnets with electromagnets.

Facilitation Tip

During Polarity Flip, provide colored tape to mark wire ends so students can easily reverse connections.

What to look for

During the construction phase, circulate and ask students to demonstrate reversing the battery connections. Ask: 'What happened to the nail when you reversed the wires? What does this tell us about the electromagnet?'

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Activity 04

• Project-Based Learning
• 30 min · Small Groups

Compare Station: Permanent vs Temporary

Set stations with permanent magnets and student-built electromagnets. Test lifting power, then disconnect power from electromagnets. Groups note three differences and present to class.

Design an electromagnet using common classroom materials.

Facilitation Tip

During Compare Station, assign roles like recorder, tester, and observer to keep all students engaged.

What to look for

Give students a small nail, wire, and battery. Ask them to build a working electromagnet and pick up at least 3 paperclips. On their exit ticket, they should draw their setup and write one sentence explaining why it works.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

A few notes on teaching this unit

Start with a quick demonstration of a simple electromagnet to hook students, then let them explore through guided trials. Avoid long lectures about magnetism theory; instead, let students discover the relationship between current and magnetism through their own experiments. Research shows hands-on building deepens understanding more than passive observation.

Students should confidently explain that wrapping more coils or adding batteries increases strength, and that reversing wires changes the poles. They should demonstrate this by adjusting their electromagnets and predicting outcomes before testing.

---

Watch Out for These Misconceptions

• During Build-and-Test, watch for students who believe electricity and magnetism are unrelated.

  After wiring their electromagnet, have students list the steps they took and describe how the current created a magnetic field. Ask groups to share observations like 'The nail became magnetic when we connected the wires.'

• During Compare Station, watch for students who assume all electromagnets are stronger than permanent magnets.

  During the station rotation, ask students to compare their electromagnet’s lift with a bar magnet’s lift using the same small objects. Prompt them to consider why their electromagnet might lift fewer paperclips despite being powered.

• During Polarity Flip, watch for students who think electromagnet poles cannot be changed.

  Before flipping wires, ask students to predict which end will attract a paperclip after reversing connections. After testing, have them note the change and explain how the current direction altered the magnetic field.

---

Methods used in this brief

• Project-Based Learning