b. When more current flows through the coil, the electromagnet’s magnetic field becomes stronger, the magnetic force between the coil and the permanent magnet increases, and the coil turns faster. ) Teacher Support & Planning Section 3 Producing Electric Current A. From mechanical to electrical energy production of an electric current by moving a loop of 1. Electromagnetic induction—the wire through a magnetic field or moving a magnet through a wire loop device that produces electric current by rotating a coil of wire in a magnetic 2. Generator—a a. The wire coil is wrapped around an iron core and placed between the poles of a permanent magnet. b. Coil is rotated by an outside source of mechanical energy. As the coil turns within the magnetic field of the permanent magnet, an electric current c. through the coil. Direction of the current in the coil in a generator changes with each revolution. d. 3. Generating electricity Electricity used in the home comes from a power plant with huge generators. a. b. of electromagnets in the generators usually connected to a turbine—a large wheel that rotates when pushed by wind, or steam. B. Direct and alternating currents is current that flows in only one direction through a wire. 1. Direct current (DC) 2. Alternating current (AC) reverses the direction of the current flow in a regular way. a. In America, generators produce alternating current at a frequency of 60 cycles per second, or 60 Hz. b. A 60-Hz alternating current changes direction 120 each second. C. Transformer—a device that increases or decreases the voltage of an alternating current 1. Made of two coils (primary and secondary) wrapped around the same iron core. 2. Changing current in primary coil creates changing magnetic around the iron core, which induces an alternating current in the secondary coil. 3. A step-up transformer increases voltage. The secondary coil has more turns of wire than the primary coil does.
b. When more current flows through the coil, the electromagnet’s magnetic field becomes stronger, the magnetic force between the coil and the permanent magnet increases, and the coil turns faster. ) Teacher Support & Planning Section 3 Producing Electric Current A. From mechanical to electrical energy 1. Electromagnetic induction—the production of an electric current by moving a loop of wire through a magnetic field or moving a magnet through a wire loop 2. Generator—a device that produces electric current by rotating a coil of wire in a magnetic a. The wire coil is wrapped around an iron core and placed between the poles of a permanent magnet. b. Coil is rotated by an outside source of mechanical energy. c. As the coil turns within the magnetic field of the permanent magnet, an electric current through the coil. d. Direction of the current in the coil in a generator changes with each revolution. 3. Generating electricity a. Electricity used in the home comes from a power plant with huge generators. b. of electromagnets in the generators usually connected to a turbine—a large wheel that rotates when pushed by wind, or steam. B. Direct and alternating currents 1. Direct current (DC) is current that flows in only one direction through a wire. 2. Alternating current (AC) reverses the direction of the current flow in a regular way. a. In America, generators produce alternating current at a frequency of 60 cycles per second, or 60 Hz. b. A 60-Hz alternating current changes direction 120 each second. C. Transformer—a device that increases or decreases the voltage of an alternating current 1. Made of two coils (primary and secondary) wrapped around the same iron core. 2. Changing current in primary coil creates changing magnetic around the iron core, which induces an alternating current in the secondary coil. 3. A step-up transformer increases voltage. The secondary coil has more turns of wire than the primary coil does.
Chapter%208%20Magnetism%20and%20Its%20Uses%20webnotes.docx