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Chapter 22 Current Electricity

Chapter 22 Current Electricity. Milbank High School. Sec. 22.1 Current and Circuits. Objectives Define an electric current and the ampere Describe conditions that create current in an electric circuit Draw circuits and recognize that they are closed loops Define power in electric circuits

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Chapter 22 Current Electricity

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  1. Chapter 22Current Electricity Milbank High School

  2. Sec. 22.1Current and Circuits • Objectives • Define an electric current and the ampere • Describe conditions that create current in an electric circuit • Draw circuits and recognize that they are closed loops • Define power in electric circuits • Define resistance and describe Ohm’s law

  3. Electric Currents • Electric current • A flow of charged particles • Conventional current • conductors • Battery • Photovoltaic cell

  4. Electric Circuits • Closed loop

  5. Rate of Charge Flow • Coulomb • Ampere • Power P = IV • Example Problem Pg. 511

  6. Resistance and Ohm’s Law • Resistance R = V/I Resistance (R) is the ratio of potential difference (V) to the current (I) • Ohm’s Law • Resistors • Superconductors

  7. Drawing Electric Circuits • Schematic • Parallel Connection • Ammeter • Series Connection • Symbols

  8. Sec. 22.2Using Electric Energy • Objectives • Explain how electric energy is converted into thermal energy • Determine why high-voltage transmission lines are used to carry electric energy over long distances • Define kilowatt-hour

  9. Using Electric Energy • Electric energy is converted to mechanical energy (motor) • Electric energy converted to light (lamp) • Both of these get hot (some energy is converted to thermal energy) • Heating resistors • Space heater, hot plate, iron • Act as resistors in a circuit E = I2Rt

  10. Transmission of Electric Energy • Thermal energy is produced at a rate of P = I2R • Used to calculate thermal energy loss in long-distance transmission • Kilowatt-hour • Equal to 1000 watts delivered continuously for 3600 seconds (1 hour)

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