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Transcript
Chapter 26 Direct Current Circuits Introduction: Our approach • EMF: Get more precise • Consider combinations of resistors • Understand circuits (with R and C) in general with Kirchoff’s Laws • Consider combinations of batteries • Consider safe practices EMF • How do we distinguish between the emf of a battery and its terminal voltage? • What generally happens to the electrical properties of a battery as it becomes weaker? Combinations of Resistors • What is the equivalent resistance of resistors in series? • What is true about the currents through and the voltages across each resistor? • What is the equivalent resistance of resistors in parallel? • What is true about the currents through and the voltages across each resistor? Kirchhoff’s Rules • What are the two basic physical ideas that underlie the two Kirchhoff’s rules? • What are the two Kirchhoff’s rules? • To what end and how in general are they applied? RC Circuits • How is a simple RC series circuit (battery, resistor, capacitor in series) diagramed? • Derive the equations representing what is happening in this circuit. • How is a proposed solution checked to see if it is a solution? • What is the form of the solution, (mathematically and graphically)? Combinations of Batteries • What is the combined voltage and equivalent internal resistance of batteries in series and parallel? • How should a strong battery be used to help a weaker battery during a “jump start”? Why? Safety • What are some safety practices around electric currents and voltages? • What is the physical basis for these practices? The End