Electricity

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  • ELECTRICITY
    • Static
      • When materials are rubbed against each other...
        • Electrons move from one material to another
        • Material that loses electrons becomes +
        • Material that gains electrons becomes -
        • Equal but opposite charges in each material
      • Only negative charges move
      • Opposite charges attract
      • Same charges repel
    • Circuits
      • Current
        • Ammeter
          • Series
        • = charge / time
        • Rate of flow of charge
        • More cells = bigger p.d. = more current
      • Volts
        • Voltmeter
          • Parallell
        • = work done / charge
        • Work done
        • Total p.d. = sum of p.d.
      • Series
        • Current is the same
        • P.d. is shared
        • Resistance adds up
      • Parrallel
        • Current is shared
        • P.d. is the same
    • Resistance
      • = p.d. / current
      • Moving electrons collide with ions  in the metal
        • Makes it more difficult for current to flow (resistance)
        • Hotter ions = vibrate more = more collisions with electrons = greater resistance
    • Household
      • UK mains = 230V = 50Hz
      • DIRECT CURRENT - current flows in one direction
      • ALTERNATING CURRENT - current constantly changes direction
      • Plugs & Cables
        • Neutral (blue)
        • Live (brown)
        • Earth (green/yellow)
        • Plastic, brass pins, fuse, cable grip
      • Too much current - fuse breaks
        • Protects wiring and appliance
          • Piece of wire heats up & melts easily
        • Circuit breakers = quicker, don't need replacing
      • Earthing
        • Safe route for current if live wire touches casing
          • Strong current = low resistance = breaks fuse

Comments

Miss KHP

This mind map is a great revision tool because of the short, concise information used, and the colours. Great tool! 

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