AQA AS Physics Electric Current

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  • Electric Current
    • Component and their characteristics
    • Potential difference and Power
      • Electrical power and Current
        • Work done = QV = (I?t) V = IV ?t
        • P = IV
      • Energy and Potential differece
        • Potential Difference is defined as the work done (or energy transferred) per unit charge.
          • V = W / Q
        • The mf of a source of electricity is defined as the electrical energy produced per unit charge passing through the source.
    • Resistance
      • Ohm's law
        • It states that the pd across a metallic conductor is proportional to the current through it, provided that the physical conditions to not change.
      • Resitivity
        • ? = RA / L
      • Resistance
        • The resistance of any component is defined as: the pd across the component / the current trough it.
          • R = V / I
      • Superconductors
        • A superconductor is a wire ot a device made of material that has zero resistivity at and below a critical temprature that depends on the material.
    • Current and Charge
      • ?Q = I?t
      • I = ?Q/?t
  • Work done = QV = (I?t) V = IV ?t
  • Resistance
    • The resistance of any component is defined as: the pd across the component / the current trough it.
      • R = V / I

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