Electricity

    Cards (11)

    • How does the resistance of a thermistor change with temperature
      As temperature increases the resistance decreases
    • How does the resistance of an LDR change with light?
      As light intensity increases, LDR resistance decreases
    • What can we assume for a series circuit?
      The current is the same all the way around, voltage is shared between components
    • What can we assume for a parallel circuit?
      The current is shared between branches, voltage is the same on each branch
    • How must an ammeter be connected?
      In series
    • How must a voltmeter be connected?
      In parallel
    • Define national grid
      System of cables and transformers linking power stations to consumers
    • State the properties of the UK mains ac supply
      230 volts, 50 hertz
    • Name the 2 types of transformers and what they do
      Step up- increases voltage, decreased current
      Step down- decreases voltage, increases current
    • State the colours and functions of the 3 wires in a 3 core cable
      Blue= neutral, brown= live, yellow/green= earth
    • How does an earth wire prevent electrocution?
      Allows a large current to flow to earth, then the fuse blows
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