5.2 current and voltage

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5.2 current and voltage

  1. 1. Brainiac<br />http://www.youtube.com/watch?v=-n1pSHzdahc<br />
  2. 2. 5.2 Current and Voltage<br />16 January 2011<br />What are the key words to do with ‘electricity’? Can you define them?<br />
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  13. 13. Aims<br />State the equations of current and voltage in a series circuit<br />Describe the changes in current and voltage in a series circuit<br />Define current and voltage<br />
  14. 14. Current<br />
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  16. 16. What if we apply the brakes?<br />
  17. 17. For a series circuit:<br />The current is the same throughout the circuit<br />
  18. 18. Current is the rate of flow of charge<br />
  19. 19. Current<br />A<br />☺<br />☺<br />☺<br />☺<br />☺<br />I’m counting how many coulombs of electrons go past me every second<br />☺<br />☺<br />The number of Coulombs flowing past a point in the circuit every second.<br />I = Q/t<br />☺<br />☺<br />☺<br />☺<br />1 Amp = 1 coulomb per second<br />
  20. 20. Voltage<br />
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  22. 22. For a series circuit:<br />The total voltage is the sum of the individual voltages<br />
  23. 23. Voltage(emf)<br />☺<br />☺<br />☺<br />V<br />☺<br />☺<br />☺<br />☺<br />☺<br />☺<br />☺<br />☺<br />I’m checking the difference in energy (per coulomb) between the 2 red arrows<br />1 Volt = 1 Joule per coulomb<br />
  24. 24. Voltage (p.d.)<br />☺<br />☺<br />☺<br />V<br />☺<br />☺<br />☺<br />☺<br />☺<br />☺<br />☺<br />☺<br />I’m checking the difference in energy (per coulomb) before and after the lamp<br />1 Volt = 1 Joule per coulomb<br />
  25. 25. Voltage is the energy transferred per charge<br />

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