Transcript Magnet
How are Electricity and Magnetism Related? Content Goals ~ Students will learn how electric currents are like magnets. ~ Students will learn how generators and motors work. Magnets A Magnet is an object that attracts iron and a few (not all) other metals. Some magnets are shaped like bars, u-shaped, or thin, flat shapes. •Distance affects the strength of attraction. •Other forces can overcome the force of a magnet. •Barriers can interfere with the magnet’s strength of attraction. •Magnets can make some other objects magnetic. Magnetic Poles A magnet has two places at which its force is the strongest. Each of these is called a Magnetic Pole. •Magnets of every shape have N and S poles. They keep their poles even if you change their shape. •Opposite pole forces attract or move together. •Like pole forces repel or push away from each other. Magnetic Field Magnetic Field is the space around a magnet in which the force of the magnet acts. The iron fillings around the magnet show the shape of the magnetic field. The fillings form circles that start and end at the poles of the magnet. This also shows where the pull of the magnet is strongest. Electromagnets An Electromagnet is a temporary magnet. •It has a magnetic force only when an electric current moves through the wire. •An electric current produces a magnetic field around a wire. •Field around a single wire is weak, but stronger around many wires that are close together. Click Here to play the Electromagnets Game Generators A Generator is a device that produces an electric current. •Electricity can produce a magnetic field & a magnetic field can produce electricity. •Moving a coil of wire near a magnet, current electricity flows in the wire. •Generators use motion to produce electricity. Click above to watch how a generator works. Motors An Electric Motor is a device that changes electrical energy to mechanical energy. •In some motors, an electromagnet lies between the poles of a permanent magnet. •The poles are pushed away from the like poles and pulled towards the opposite poles. •The current of the electromagnet reverses and its N become its S pole causing the shaft to continue spinning. Other Uses of Magnets •Compasses •Computers •CD Players •Stereo Speakers •Telephones •Doorbells •Credit Cards •Many More!!!