Lecture in Electric Currents | Physics

Lesson Objectives – the students should be able to:

Lecture on Electric Currents PPT

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• Applied Physics Course Outline

Summary of Chapter 18

• A battery is a source of constant potential difference.
• Electric current is the rate of flow of electric charge.
• Conventional current is in the direction that positive charge would flow.
• Resistance is the ratio of voltage to current:
  
• Ohmic materials have constant resistance, independent of voltage.
• Resistance is determined by shape and material:
  
• ρ is the resistivity.
• Power in an electric circuit:
  
• Direct current is constant
• Alternating current varies sinusoidally
  
• The average (rms) current and voltage:
  
• Relation between drift speed and current:
  

Units of Chapter 18 – Keywords

• The Electric Battery
• Electric Current
• Ohm’s Law: Resistance and Resistors
• Resistivity
• Electric Power
• Power in Household Circuits
• Alternating Current
• Microscopic View of Electric Current
• Superconductivity
• Electrical Conduction in the Human Nervous System
• Volta
• electrolyte

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