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# 5.5 ohms law

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### 5.5 ohms law

1. 1. 1 February 2011<br />5.5 Ohm’s Law<br />Copy down this table please<br />
2. 2. Learning objectives<br />Investigate the relationship between V, I and R<br />Show that I = V/R and plot I against V<br />Practise using I = V/R<br />
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7. 7. Ohm’s Law<br />Voltage<br />Resistance<br />Current<br />
8. 8. V<br />I<br />R<br />
9. 9. Worked example 1 <br />A circuit has a voltage of 12 V and a resistance of 100 Ω. What is the current going around the circuit?<br />
10. 10. Worked example 1 <br />A circuit has a voltage of 12 V and a resistance of 100 ohms. What is the current going around the circuit?<br />
11. 11. Question 1<br />What is the current in the circuit?<br />6 V<br />200 Ω<br />
12. 12. Question 2<br />What is the value of the resistor in this circuit?<br />3 V<br />150 mA<br />
13. 13. Question 3<br />What is the electromotive force from the cell?<br />100 mA<br />500 Ω<br />
14. 14. Ohm’s law<br />The current through a conductor is proportional to the voltage across it – provided the temperature remains constant<br />An electric current causes heating which makes things complicated<br />