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Ee1 chapter8 intermal_resistance

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  • 1. IT2001PAEngineering Essentials (1/2)Chapter 8 – Internal Resistance Lecturer Namelecturer_email@ite.edu.sg Aug 16, 2012Contact Number
  • 2. Chapter 8 – Internal ResistanceLesson Objectives Upon completion of this topic, you should be able to:  Calculate the emf, terminal voltage and current of a cell.. IT2001PA Engineering Essentials (1/2) 2
  • 3. Chapter 8 – Internal ResistanceSpecific Objectives Students should be able to : Explain the internal resistance of a cell. Explain the electromotive force (EMF) of a cell. Explain the internal resistance of a cell. Statethat the emf of a cell can be calculate using the equation E = V + Ir IT2001PA Engineering Essentials (1/2)
  • 4. Chapter 8 – Internal ResistanceInternal Resistance of a Cell Resistance offered by internal components of cell. Internal resistance, r, decreases () if  Size of plate   Distance between plates  IT2001PA Engineering Essentials (1/2) 4
  • 5. Chapter 8 – Internal ResistanceInternal Resistance of a Cell where V = terminal voltage of cell V = E – Ir E = open circuit voltage of cell r = internal resistance of cell V = IR R = load resistance I = load current IT2001PA Engineering Essentials (1/2) 5
  • 6. Chapter 8 – Internal ResistanceElectromotive Force (emf) of a Cell The emf (E) of a cell is the total voltage generated by the cell is measured with the cell open-circuit (also called open circuit voltage of cell). IT2001PA Engineering Essentials (1/2) 6
  • 7. Chapter 8 – Internal ResistanceTerminal Voltage of a Cell The terminal voltage, or potential difference (p.d.) of a cell, is the voltage across the cell terminals when the cell is supplying current to a load. V is less than the value of E when the cell is supplying current to a load. IT2001PA Engineering Essentials (1/2) 7
  • 8. Chapter 8 – Internal ResistanceCalculation on Cells IT2001PA Engineering Essentials (1/2) 8
  • 9. Chapter 8 – Internal ResistanceNext Lesson IT2001PA Engineering Essentials (1/2) 9