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test 2 study guide

Cold fusion has been seen in laboratory experiments

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Cold fusion; has been seen in laboratory experiments At Three Mile Island; some of the uranium fuel melted What distinguishes a breeder reactor from other reactors is that; it makes more fuel than it uses Jupiter is not a star because; it isn;t massive enough Chapter 6 Current is measured by; amps A volt is a measure of; energy per electron Magnetism comes from; moving electric charge In a permanent magnet, the magnetism comes from; the spin of the electrons Magnetic monopoles; have never been found Rail guns push the projectile using; magnetic fields Telsa wanted to use a transformer to distribute electricity because; it decreased the current going through long wires to reduce the loss of electricity. You can demagnetize a natural magnet; by heating it above the Curie point What discovery now allows for headphones to be small and light; rare-earth magnets, such as cobalt Which of the following use or consist of permanent magnets; transformers Theoretically, the Earth should not have a permanent magnet in its core because; its interior is too hot The Earth’s magnetism comes from; a dynamo in the core The Earth flips it’s magnetism, on average, approximately; twice every million years The north geographic pole of the Earth; is a south magnetic pole Compasses point north because; there are electric currents in the iron core of the Earth Electricity will heat a wire if it has; high frequency Static electricity occurs when two surfaces rub against each other and; electrons flow from one to another Europe uses higher voltage in homes because it; creates less heat in home wiring Lights and TVs in Europe tend to flick because Europe uses; 50 Hertz-the United States uses 60 Hertz When an object loses some electrons, it; has a positive charge To get a spark, you normally need; high voltage A fuse is used in a house to prevent; house wires from overheating The Earth’s magnetic flips are used for; geologic dating In a metal, electrons; can move freely The aspect of electricity that would make it most dangerous is high; current A certain kind of generator uses its own electricity to strengthen its magnetic field. Such a generator is called a; dynamo The original superconductors were cooled with; liquid helium Room-temperature superconductors; have no practical applications High-temperature superconductors operate at approximately; -123 C(liquid nitrogen temperature) We use AC instead of DC because; AC can use transformers Topsy was executed with AC; to show the dangers of high voltage Edison wanted; a power plant on every city block
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