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Electrical Current. I. What is Electrical Current?. Definition The rate at which charges pass a given point Units of measurement Amperes Shortened to Amps 2 Types of Current DC AKA: direct current Electrons always flow in the same direction.

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Presentation Transcript
i what is electrical current
I. What is Electrical Current?
  • Definition
    • The rate at which charges pass a given point
  • Units of measurement
    • Amperes
    • Shortened to Amps
  • 2 Types of Current
    • DC
      • AKA: direct current
      • Electrons always flow in the same direction.
      • Batteries in a camera or a flashlight use DC
    • AC
      • AKA: alternating current
      • The electrons can move in either direction
      • Electrical outlets in your home use this.
ii voltage
II. Voltage
  • Definition
    • The measure of how much work is needed to move a charge between 2 points.
  • Units of measurement
    • Volts (V)
  • Relationship between voltage and current
    • As long as there is voltage between 2 points on a wire, charges will flow in the wire.
    • The greater the voltage:
      • The greater the current.
  • Different batteries have different voltages
    • Car batteries need a bigger current to start the car so they have a higher voltage.
pictures of different batteries
Pictures of Different Batteries

9 Volts

1.5 Volts

6 Volts

iii resistance
III. Resistance
  • Definition
    • The opposition to the flow of electric charge
    • Like “electrical friction”
  • Units of Measurement
    • Ohm’s
    • Represented by the Greek letter omega ( )
  • Variables which affect resistance
    • Material
      • Good conductors have a:
        • Low resistance
        • Like Copper
      • Insulators have a:
        • High resistance
    • Temperature
      • As you increase a metals temperature
        • You increase resistance
      • Superconductors
        • Metals at very low temperature who’s resistance is virtually 0
iv electrical cells
IV. Electrical “Cells”
  • Definition:
    • These change chemical or radiant energy into electrical energy
  • Parts
    • Electrolytes
      • Mixture of chemicals which allow charges to flow
    • Electrodes
      • Made of conductors
      • Points at which charges enter and leave the cell.
  • 2 Types
    • Dry Cell
      • Electrolytes are solid or paste
      • Normal batteries
    • Wet Cell
      • Electrolytes are liquid
      • Car batteries
v electrical calculations
V. Electrical Calculations
  • Ohm’s Law
    • Relates current, voltage, and resistance
    • Voltage = Current X Resistance
    • V = I X R
  • Electrical Power
    • Power = Voltage X Current
    • P = V X I
    • Measured in Watts
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