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7 electricity & magnetism


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7 electricity & magnetism

  1. 1. Electricity & Magnetism
  2. 2. <ul><li>Electromagnet- a temporary magnet made by placing a piece of iron inside a current-carrying coil of wire. When current flows through the wire, magnetic-field lines form all around the wire. </li></ul>
  3. 3. <ul><li>When electric current flows through a wire, a magnetic field forms around the wire. The direction of the magnetic field depends on the direction of the current in the wire. </li></ul>
  4. 7. <ul><li>Galvanometers- devices that use an electromagnet to measure electric current. </li></ul><ul><li>Ex: gauges on the dashboard of a </li></ul><ul><li>car. </li></ul>
  5. 8. <ul><li>Generators- produce electric current by rotating a coil of wire in a magnetic field. </li></ul>
  6. 9. <ul><li>Direct Current (DC)- current flows in only one direction through a wire. </li></ul><ul><li>Ex: battery </li></ul>
  7. 10. <ul><li>Alternating Current (AC)- reverses the direction of the current flow in a regular way. </li></ul><ul><li>Ex: wall outlet </li></ul>
  8. 11. <ul><li>Transformer- device that increases or decreases the voltage of an AC. Transformers are used to decrease the voltage of the AC before it enters your house. </li></ul>
  9. 12. Step-up for Power Step-down Step-down Transmission Line for area for house