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Why do they use magnets in Power Plants? JOURNAL - Magnetism • Draw a bar magnet – Label the poles – Draw what the field lines would look like • How does the magnet in a power plant work? What does it do? Magnetism: Magnetic Force • Where is the magnet in the Power Plant? How does it work? Magnetism: Magnetic Force • Magnetic Force: The force a magnet exerts on another magnet, iron, or moving charges. Magnetism: Magnetic Force • The force a magnet exerts on another magnet, iron, or moving charges. • Magnetic forces attract and repel one another • Like = repel • Unlike = attract Why does this happen? From where does this force come? Magnetism: Magnetic Field • Magnetic force comes from the magnetic field that surrounds a magnet. – Strongest at the poles where field lines are CLOSE, weak where lines are FAR APART N S Magnetism: Magnetic Field • A magnetic Field exerts a force on other fields. Like poles repel because Field lines push on each other. Unlike poles attract because field lines come together. Magnetism • What makes something magnetic? • The spin of its UNPAIRED ELECTRONS. Electron spin aligns atoms and creates a magnetic field. Magnetism • A material that has all of its atoms aligned in a single DOMAIN is magnetic. Which one below is magnetic? • Unaligned atoms • Aligned atoms. • MAGNETIC! Magnetism: Earths Magnetic Field The Earth also has a magnetic field, the MAGNETOSPHERE, due to its iron core. – Allows compasses to work – Protects us from cosmic radiation Magnetism: Electromagnetic Force • Electromagnetic Force: the forces of magnetism and electricity are both caused by electric charges. – MAGNETISM – electrons spinning – ELECTRICITY – electrons traveling Magnetism: Electromagnetic Force • In the same way that spinning electrons create a magnetic field, traveling electric charges also create a magnetic field. (see page 636) Magnetism: Electromagnetic Force • How is this useful? • USES: Solenoid: a coil of currentcarrying wire. The more turns, the stronger the magnet. It creates a controlled magnetic field useful for many things. Magnetism: Electromagnetic Force • USES: Electromagnet: a coil of current-carrying wire with an iron core. The more turns, the stronger the magnet. Used in junkyards to lift heavy materials. Magnetism: Electromagnetic Force • USES: Turbine Generator – a device that induces (creates) an electrical current by spinning a magnet inside a coil of wire or vice versa. Magnetism: Electromagnetic Force • USES: Turbine Generator – a device that creates an electrical current by spinning a magnet inside a coil of wire or vice versa. Used at electrical power plants to create electricity. Magnetism: Electromagnetic Force • USES: Turbine Generator – a device that creates an electrical current by spinning a magnet inside a coil of wire or vice versa. Used at electrical power plants to create electricity. Magnetism: Electromagnetic Force • USES: Transformer – a device that increases or decreases voltage and current. Used when electricity is being transported to your home for use. Magnetism: Electromagnetic Force • USES: Transformer – a device that increases or decreases voltage and current. Which one increases? Decreases?