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1、Ohms law,在同一电路中,导体中的电流跟导体两端的电压成正比,跟导体的电阻成反比,这就是欧姆定律 .,欧姆定律公式:I=U/R,Fast reading,Answer the following questions according to the text. 1.Who was Ohm? 2.What contribution did Ohm make in physics? 3.Can you tell Ohms Law in English? 4.What is potential difference? 5.How do you calculate voltage in a ci

2、rcuit? 6. How do you calculate resistance in a circuit?,Careful reading,Paragraph 1,Georg Simon Ohm(1787-1854),A German physicist,Electrical currents,The unit of electrical resistance,Formulation of the relationship between current ,electromotive force and resistance,paragraph2,Electric circuit,A co

3、ntinuous path,Conductors,Conducting devices,A source of power,Not continuous,(a closed circuit),(an open circuit),Paragraph 3,4,The current flowing through a resistor is directly proportional to the potential difference across its ends providing the temperature remains constant.,R=V/I (resistance =v

4、oltage/current),The conductor between the two locations,The potential difference,The amount of current,(DC,AC),Example,If a current of 2 amperes flows through the circuit which has a resistor of 10 ohms ,and the resistance of the wire used in the circuit is 6 ohms, calculate the voltage or the potential difference across the circuit.,R=R1+R2=10 +6 =16 V=I

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