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Transcript
Chapter 13 Electricity and Magnetism Lesson 4 How is electricity transformed to magnetism? Page 386-389 Hans Oersted discovered that the forces of magnetism and electricity are closely related An electromagnet is a coil of wire wrapped around an iron core The strength of an electromagnet can be changed Electricity and magnetism are closely related. Both are the result of charged particles moving. The combination of these forces, electromagnetism, is very useful in our daily lives. An electromagnet is a coil of wire with many loops which an electric current passes To make the field eve stronger, the coil is often wrapped around an iron core More coils make the electromagnet stronger A larger core makes the electromagnet stronger 3 ways to make a magnet stronger: *increasing the amount of current running through the wire *increase the number of coils *make magnetic core larger Like a bar magnet, an electromagnet has a north and south pole Electromagnets have many uses in industry and in everyday electronic products Chapter 13 Lesson 4 Page 2 An electric motor uses magnets and electromagnets to produce motion Electromagnets are found in: *televisions *fans *VCRs *doorbell *motor *earphones A simple motor has 6 parts: *battery *rotor *permanent magnet *brush *commutator *axle
