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Name Date Class Lesson Outline LESSON 3 Making an Electric Current with Magnets A. Magnets and Wire Loops Electric Current 1. Magnetic fields can produce moves in a wire loop that is part of a(n) when a magnet Closed electric Stops circuit; if the magnet stops moving, the current . 2. Another way an electric current can be produced is when a(n) Coil of wire moves through a(n) Magnetic field . B. Electric Generators Generator 1. An electric is a device that uses a magnetic field to Mechanical change energy to electrical energy. 2. Electric generators differ from batteries because batteries produce Direct current, which is an electric current that flows in only Direction one . Alternating Direction 3. Most electric generators produce electric current that changes current, which is an in a regular pattern. Commutator a(n) that prevents the current from changing direction. C. Generators and Power Plants Coils 1. Increasing the number of Loops and the number of in each coil increases the amount of electric current a generator produces. 2. A generator transforms Electrical Mechanical energy to energy. a. The source of mechanical energy in some power plants comes from high-pressure jets of steam from b. Hydroelectric Boiling water. power plants use the mechanical energy from falling water. 48 Magnetism Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. 4. An electric generator can produce a direct current if the generator uses Name Date Class Lesson Outline continued 3. In electrical power plants, a generator is usually is connected to a(n) Turbine . Shaft a. A turbine is a(n) Spins with a set of blades that when a pressurized fluid strikes the blades. Mechanical b. A turbine transfers energy to the generator. D. Transformers—Changing Voltage Alternating 1. A transformer changes the voltage of a(n) Coils 2. A transformer contains two Iron a(n) current. of wire wrapped around core. a. An alternating electric current in the primary coil produces a changing Magnetic Field around the core. Alternating b. This changing magnetic field produces a(n) current in the secondary coil. 3. If the input voltage to the primary coil increases, then the output voltage from the secondary coil Increases . Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. E. Electrical Energy—From a Power Plant to Your Home Step-up 1. current that is produced by transformers increase the voltage of the alternating Generators 2. Before electric current enters your home, a(n) in electrical power plants. Step-down transformer decreases the voltage of the current to Magnetism 120 volts . 49