Current & Potential Difference

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  • Created by: Jo Wells
  • Created on: 29-12-12 18:16
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  • Current & Potential Difference
    • "The greater the RESISTANCE across a component, the SMALLER THE CURRENT that flows"
      • For a given Potential Difference (V) across the component
    • CURRENT (ampere, A) = flow of electric charge around circuit
      • Current will only flow if there's a potential difference across that component
    • POTENTIAL DIFFERENCE or P.D. (volt, V) = driving force that pushes current round
    • RESISTANCE (ohm, ?) = anything in circuit that SLOWS the flow down
    • Charge = Current X Time
      • Q = I X t
      • Charge is measured in COULOMBS (C)
      • More charge passes around circuit when bigger current flows
    • P.D. = Work done per unit charge
      • P.D. = Work Done / Charge
        • W = V X Q
      • (energy transferred)

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