1 / 10

21.3 Electrical Energy Generation and Transmission

21.3 Electrical Energy Generation and Transmission. Assessment Questions 1-8. Generating electric current. Electric current creates a magnetic field

ryann
Download Presentation

21.3 Electrical Energy Generation and Transmission

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 21.3 Electrical Energy Generation and Transmission Assessment Questions 1-8

  2. Generating electric current • Electric current creates a magnetic field • LT #2: Demonstrate and explain that an electric current flowing in a wire will create a magnetic field around that wire (electromagnetic effect) [Motors] • A magnetic field can be used to produce an electric current = electromagnetic Induction = generator effect • LT #3: Demonstrate and explain that moving a magnet near a wire will cause an electric current to flow in the wire (the generator effect) [Generators]

  3. 1. How is voltage induced in a conductor? • Conductors are materials through which charge can flow easily (metal wires) • Voltage is induced in a conductor by a changing magnetic field. • So if you move a magnet near a conductor electric current is generated

  4. 2. Name two types of generators. • AC = alternating current; charges flow in one direction then reverse direction & converts mechanical energy into electrical energy • LT #1: Demonstrate and explain that an electric current flowing in a wire will create a magnetic field around that wire (electromagnetic effect) • DC = direct current; the current that leaves the generator flows only in one direction • Most power plants use AC because sending power over long distances & DC causes too much heat in wires

  5. 3. How does a transformer work? • A transformer increases or decreases voltage and current of 2 linked AC circuits • It changes voltage and current by generating a changing magnetic field in one coil. • This field then induces a current in a nearby coil with a different # of turns. • We need transformers to step up power to send it over long distances & step down power to make it safe to use in homes

  6. 4. Name the 6 sources of electrical energy in the United States. • Coal • Nuclear power • Water = hydroelectric • Wind • Natural gas • Petroleum

  7. 5. How can water be used to create electrical energy? • Water can turn a turbine (PE  KE mechanical) • The turbine turns an axle of a generator & produces electricity (mechanical  electrical) • LT #1: Describe a situation where energy is transformed from one form to another.

  8. 6. What is the connection between Faraday’s law & the generation of electrical energy? • Faraday’s law = a voltage is induced in a conductor by a changing magnetic field • The relative motion of a magnet & a coil of wire will cause charges to flow in the wire generating electric current and electrical energy

  9. 7. How are AC & DC alike? How are they different? • Both produce electric current by rotation of wire coil in a magnetic field • In a DC generator current only flows in one direction

  10. 8. Why can’t we use electrical energy directly from a high voltage line? • We’d fry! • High voltages are dangerous & household devices are designed to use much lower voltages

More Related