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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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Presentation Transcript
sec 22 1 current and circuits
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
electric currents
Electric Currents
  • Electric current
    • A flow of charged particles
  • Conventional current
    • conductors
  • Battery
  • Photovoltaic cell
rate of charge flow
Rate of Charge Flow
  • Coulomb
  • Ampere
  • Power

P = IV

  • Example Problem Pg. 511
resistance and ohm s law
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
drawing electric circuits
Drawing Electric Circuits
  • Schematic
  • Parallel Connection
  • Ammeter
  • Series Connection
  • Symbols
sec 22 2 using electric energy
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
using electric energy
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

transmission of electric energy
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)