Electrical Current

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# Electrical Current - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Electrical Current' - edana

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Presentation Transcript

### 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
• 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

9 Volts

1.5 Volts

6 Volts

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”
• Definition:
• These change chemical or radiant energy into electrical energy
• Parts
• Electrolytes
• Mixture of chemicals which allow charges to flow
• Electrodes
• 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
• 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