Fundamentals Of Electricity (Chathu)
- 1. Fundamentals Of Electricity H.P.K.C Jayaweera. Faculty of Engineering Technology
- 2. Outline History of Electricity Atom Voltage Current Resister Power Electrical Circuits
- 3. History of Electricity Franklin Invents Lightning Rods – 1752 Faraday Discovers Electromagnetic Induction – early 1800’s Edison Invents the Light Bulb and Generating Stations in NYC – 1882 Tesla Invents Alternating Current Motor for Westinghouse - 1888
- 4. Atom An atom is the smallest particle of an element that retains all the properties of that element Protons = positive charge Neutrons = no charge Electrons = negative charge
- 5. Voltage Voltage – Unit of measurement of electromotive force (EMF) The Electromotive Force Which Must Be Applied To Create Flow Of Electrons Commercial Current Is 120 V or 220 V
- 6. Current Current - Continuous movement of electrons past a given point. Measured in amperes (A)
- 7. Current Direct Current (DC) Flow of Electrons Always In Same Direction
- 8. Current Alternating (AC) Flow of Electrons Changes Direction
- 9. Resistance Resistance – Opposition to movement of electrons. Makes it possible to generate heat, control current flow, & supply correct voltage to devices Measured In Ohms Ohm’s law Current Flow= Voltage Resistance
- 10. Power Measure in watts Power = Voltage X Current • P=VI • P=I2R • P=V2/R
- 11. Electrical Circuits Series Circuit One Path For Current To Take Component Resistors Placed End To End Total Resistance = Sum of Resistances Total Voltage = Sum of Voltage
- 12. Parallel Circuit Component Resistors Placed Side to Side With Ends Connected Current Chooses Path With Least Resistance Resistors Have Lower Resistance But Higher Current Flow Than A Series
- 14. Thank You !