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Ch 20 2 Electric Current And Ohm’S Law
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Ch 20 2 Electric Current And Ohm’S Law

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  • 1. Electric Current and Ohm’s Law 20-2
  • 2. Electric Current
    • A continuous flow of electric charge.
    • Measured in amps (A) = 1 coulomb per second
    • Direct current (DC) when charge flows in one direction
    • Alternating current (AC) is a flow of electric charge that regularly reverses direction.
    • EX – home plugs and lights
  • 3. Electrical Conductors and Insulators
    • Conductors are materials through which charge can easily flow
      • Metals and water
    • Insulators are materials through which a charge cannot flow easily.
      • Wood, plastic, rubber and air
  • 4. Resistance
    • Opposition to the flow of charges in a material
    • Measured in ohm.
    • A material’s thickness, length, and temperature affect its resistance.
    • A thinner, longer and hotter wire increase resistance.
    • Superconductor has almost 0 resistance
  • 5. Voltage
    • In order for a charge to flow in a wire, the wire must be connected in a complete loop that includes an energy source.
    • Potential difference - difference in potential energy between 2 places in an electric field
    • Measured in volts – joules per coulomb
    • Batteries convert chemical energy into electrical energy.
  • 6. Ohm’s Law
    • Voltage (V), in a circuit equals the product of the current(I) and the resistance ( R).
    • V = I x R or I = V/R
    • Increasing voltage increases current. Keeping same voltage and increasing the resistance decreases the current