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Magnetism from Electricity

Magnetism from Electricity. Unit 11 Section 2. I. Electromagnetism. Electromagnetism is the interaction between electricity and magnetism. An electric current produces a magnetic field , but it is not very strong.

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Magnetism from Electricity

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  1. Magnetism from Electricity Unit 11 Section 2

  2. I. Electromagnetism • Electromagnetism is the interaction between electricity and magnetism. • An electric currentproduces a magnetic field, but it is not very strong. c. Two devices are used to strengthen the magnetic field made by an electric current (charges traveling through a wire) • solenoids • electromagnets

  3. II. Solenoids • A solenoid is a coil of wire with an electric current in it. • To strengthen the magnetic field of a solenoid you can: • Increase the loops per meter that are used. • Increase the current (amount of charges) in the wire by adding another energy source (battery). Soleniod

  4. III. Electromagnets • An electromagnet is made up of a solenoid wrapped around an iron core. • When an electric current is present in the solenoid (coils), the electromagnet acts as a magnet. • Solenoids and electromagnets have a magnetic field only when there is an electric current in it. iron core solenoid

  5. IV. Increasing the Strength of Electromagnets • There are 3 ways to increase the strength of an electromagnet: 1. Add a bigger energy source (battery) 2. Increase the amount of coils 3. Add an iron core

  6. V. Applications of Electromagnetism • Electromagnets can be used in doorbells and electric motors. • Electric motors can be found in washing machines, power windows and your computers hard drive.

  7. VI. Electric Motors • An electric motor is a device that changes electrical energy into mechanical energy. • Electric motors have an armature, or a loop of wire that can rotate. • They also have a commutator that causes the electric current in the coil to change directions. • The commutator is what keeps the armature rotating.

  8. VII. Differences Between Bar Magnets and Electromagnets • Electromagnets can be turned off. • The polarity (poles) on an electromagnet can be switched. • You can increase/decrease the strength of an electromagnet

  9. Quickie Quiz True or false? Electromagnetism is the interaction between electricity and magnetism.

  10. Quickie Quiz TRUE Electromagnetism is the interaction between electricity and magnetism.

  11. Quickie Quiz Which of the following are ways To increase the power of a solenoid? (could be more than one) • Increase loops of coil • Increase the size of the iron core • Increase the current in the wire. • Increase the amount of magnets

  12. Quickie Quiz Which of the following are ways to increase the power of a solenoid? (could be more than one) • Increase loops of coil • Increase the size of the iron core • Increase the current in the wire. • Increase the amount of magnets

  13. Quickie Quiz Which is NOT part of an electromagnet? • Wire • Battery • Compass • Magnet

  14. Quickie Quiz Which is NOT part of an electromagnet? • Wire • Battery • Compass • Magnet

  15. Quickie Quiz An _________________ changes electrical energy into mechanical energy. • Magnet • Electromagnet • Compass • Electric Motor

  16. Quickie Quiz An _________________ changes electrical energy into mechanical energy. • Magnet • Electromagnet • Compass • Electric Motor

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