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Download Lesson 1: Magnets have 2 poles. Like poles attract, unlike poles
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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