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Lecture10_Fall2008

Lecture10_Fall2008 - Chapter Chapter 11 Electricity II...

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1 Chapter 11 : Electricity : Electricity –II II Plan 1. Electric Electric Potential Potential 2. Electric Current 3 Resistance and Ohm’s Law 3. Resistance and Ohms Law 4. Simple circuits 5. Electric Power Chapter 11: Homework Review Questions: 11, 12, 14, 16 E i 13 15 16 Exercises: 13, 15, 16 Problems: 5, 6, 8, 9 Coulomb Forces q 1 q 2 Distance 1 2 q q F k 2 2 9 2 9 10 d where N m k C = = × The SI Unit of Charge The SI unit of charge is 1 coulomb (C) Questions 1 What is the value of the elementary charge ? 1. Answer: e = 1.6 × 10 -19 C 2. How many electrons make charge of 1 C? Answer: n = 1C/ 1e =1/1.6 × 10 -19 = 6.25 × 10 18 electrons
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2 1. Electric Current Definition: Electric current is flow of electric charge . The SI unit of current is 1 ampere (A). One ampere is the rate of flow of 1 coulomb of charge per second. T he current of 1ampere is the flow of 6.25 billion billion electrons per second ! Hydraulic analogy! Wires pipes Current water mass flow rate Potential water pressure. Voltage or potential difference - A difference in pressure between two points Electric Potential or Voltage How electric current can be created? Answer: Create electrical pressure! This electrical pressure is called electric potential or voltage . Voltage and Potential Energy Voltage creates potential energy to the charge: Potential Energy = Voltage × Charge. This potential energy is then transformed into kinetic energy of moving charges moving charges.
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