7.3 voltage and current
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7.3 voltage and current

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7.3 voltage and current 7.3 voltage and current Presentation Transcript

  • http://www.youtube.com/watch?v=-n1pSHzdahc
  • 12 December 20107.3 Voltage and Current The cards have keywords with more scientific definitions, can you match them up?
  • The opposition to the flow ofcurrentThe rate of flow of chargeHow much energy each chargecarriesAll components are ina single branchComponents are inmultiple branches
  • Aims• State the equations of current and voltage in a series circuit• Describe the changes in current and voltage in a series circuit• Define current and voltage
  • For a series circuit: The current is the same throughout the circuitI  I1  I 2  I 3
  • Current is the rate of flow of charge Q I t
  • I’m countingCurrent how many coulombs of ☺ ☺ electrons go past me every ☺ second The number of ☺ Coulombs flowing ☺ past a point in the A ☺ circuit every second. ☺ I = Q/t ☺ ☺ ☺ ☺ 1 Amp = 1 coulomb per second
  • I  I1  I 2  I 3V  V1  V2  V3
  • For a series circuit:The total voltage is the sumof the individual voltagesV  V1  V2  V3
  • Voltage(emf) ☺ ☺ ☺ ☺ V ☺ ☺ I’m checking the difference in energy (per ☺ coulomb) between ☺ the 2 red arrows ☺ ☺ ☺ 1 Volt = 1 Joule per coulomb
  • Voltage (p.d.) ☺ ☺ ☺ I’m checking the ☺ difference in energy (per ☺ coulomb) before and after the lamp ☺ ☺ ☺ V ☺ ☺ ☺ 1 Volt = 1 Joule per coulomb
  • Voltage is the energy transferred per charge W V Q
  • I  I1  I 2  I 3V  V1  V2  V3
  • I have learned:I have learned: