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Transcript
Observations of Electrical Phenomena ENGR 101 Lecture Platoβs allegory of the cave β¦ The prisoners give names to the shadows. Fire is lit behind the prisoners Puppets perform in front of fire A gathering of people who have lived chained to the wall all their lives Shadows are cast on the wall Electric Current Flow of electric charge - - - - - - - - - - - - - - - - - - Not flow! Electric Current Flow of electric charge - - - - - - - - - - - - - - - - - Flow! Electric Forces Electric field at point P due to single charge F Electric force on a test charge placed at P Voltage=> Electric Field Distribution of charge +++ +++ +++ +++++++++++++++ ++ V -------------------------- +++ +++ +++ Measuring voltage β¦ Voltage is measured across the terminals of the resistor, and conveys a global picture of cause and effect, but does not convey the information at the micro level. 1 π = ππ΄ Measuring current β¦ The conductivity of a material is a measure of how easily electrons can travel through the material under the influence of an externally applied electric field. Capacitance π0 π΄ πΆ= π (Depends on geometry) Magnetic Forces Magnetic force Electromagnetic (Lorentz) force Magnetic Force on a Current Element F F (B going in to sheet of paper) Left-Hand Rule for force on a wire of current due to magnetic field (B going in to sheet of paper) Applications Motor Railgun
