Magnetism from Electricity

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Presentation transcript:

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. c. Two devices are used to strengthen the magnetic field made by an electric current (charges traveling through a wire) solenoids electromagnets

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

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

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

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.

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.

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

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

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

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

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

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

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

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

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