Magnet Magic Electromagnets

This sequence bridges the gap between electricity and magnetism by introducing simple electromagnets. Students discover that electricity can create a temporary magnetic field that can be turned on and off, contrasting with the permanent magnets they studied previously. The sequence builds from a simple circuit to constructing a functional electromagnet and simulating a scrap yard crane. By the end, students understand that magnetism can be controlled electronically.

Switch It On

Students review standard magnets and are then introduced to the concept of a magnet that can be controlled. They explore the idea that some magnetism is permanent (always on) while other forms can be temporary.

Power Path

Students learn the basics of a simple circuit using a battery, wire, and switch (or connecting wires). They focus on the safety of handling batteries and the necessity of a closed loop for electricity to flow.

Nail Power

Students wrap insulated wire around a large iron nail and connect it to a battery. They test the nail's ability to pick up paperclips when the circuit is connected, discovering that the nail becomes a magnet only when electricity flows.

Wrap Race

Students experiment with the number of wire wraps around the nail. They compare a nail with 10 wraps versus 30 wraps to see which picks up more paperclips, learning that more coils usually mean a stronger magnet.

Scrap Yard Crane

Students use their electromagnets to role-play as crane operators. They must pick up 'scrap metal' (paperclips/washers) from one pile, move it to a 'truck' (cup), and disconnect the battery to drop the load. This demonstrates the practical utility of on/off magnetism.