Presentation on theme: "Electric Current and Magnetism"— Presentation transcript:
1Electric Current and Magnetism - What Is Electromagnetism?Electric Current and MagnetismAn electric current produces a magnetic field.
2Solenoids - What Is Electromagnetism? The magnetic field produced by a current has three distinct characteristics. The field can be turned on or off, have its direction reversed, or have its strength changed.
3Solenoids - What Is Electromagnetism? The magnetic field around a solenoid resembles that of a bar magnet.
4Electromagnets - What Is Electromagnetism? A doorbell rings as the magnetic field of an electromagnet turns on and off.
5Electromagnets - What Is Electromagnetism? Electromagnets are used to lift heavy objects. A switch is turned on in the crane so that a current is produced in the electromagnet.
6Electrical Energy and Motion Electricity, Magnetism,and MotionElectrical Energy and MotionWhen a wire with current is placed in a magnetic field, electrical energy is transformed into mechanical energy.
7Generators - Electricity From Magnetism A generator uses motion in a magnetic field to produce an electric current.