Lesson 1:
Magnets have 2 poles. Like poles attract, unlike poles repel. Magnets attract iron. Magnetic force is
strongest around the poles of a magnet.
Vocab: magnet
Magnetism
Magnetic pole
Magnetic force
Lesson 2:
Magnetic fields spread out from one pole to the other. They are curves lines that never cross. The field
lines are strongest where they are closest together.
Earth is like a giant bar magnet. Compasses point to magnetic north.
Magnetic field
Magnetic field lines
Compass
Magnetic declination
Lesson 5:
An electric current produces a magnetic field. This field can change directions by reversing a current. Be
turned on and off, and change strength by increasing the power. Solenoids and electromagnets use
electric current and coiled wires to produce very strong magnetic fields. Increasing the loops of a
solenoid. The ends of a solenoid act like a bar magnet. There are 4 ways you change strength: increase
current, add loops, wind coils closer together, use a more magnetic material for the core.
Electro magnetism
Solenoid
Electromagnet
Lesson 6:
Placing a wire in a current in a magnetic field can transform electrical energy into mechanical energy. A
galvanometer measures electric current. An electric motor transforms electrical energy into mechanical
energy.
Galvanometer
Electric motor
Lesson 7:
An electric current in induced in a conductor when a conductor is moved through a magnetic field. A
generator uses motion in a magnetic field to produce a current. A transformer increases and decreases
voltage.
Electromagnetic induction
Direct current
Alternating current
Generator
Transformer
Essays topics:
Electromagnetic strength
Step up and step down transformers
Compass needles by wire currents