Electrical current
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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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Electrical Current

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Electrical current

Electrical Current


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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