Electricity

    Cards (45)

    • Ammeter goes in a series circuit
    • Voltmeter goes in a parrel circuit
    • Electric current - the rate of flow of electric charge
    • What is current measured in
      Amps
    • What is charge measured in
      Coulombs
    • What is potential difference measured in
      Volts
    • what is resistance measured in
      Ohms
    • Resistor
      • greater the potential difference the greater the current
      • resistance is constant
    • Lamp
      • As it gets hotter it gives out more light
      • So there is more resistance
    • Diode
      • only let’s current flow in one direction
      • high potential difference means lots of current can flow through
    • Light dependant resistor
      • as we increase light intensity
      • resistance decreases
    • Thermistor
      • as we heat it up
      • light intensity decreases
    • Series circuit
      • same amount of current around whole circuit
      • Potential difference will equal what it was at the start
      • Total resistance is all resistance flowing through
    • Parallel
      • current splits at junction
      • different amount of current around whole circuit
      • The potential difference is the same through whole circuit
    • What’s the voltage in the uk mains
      230
    • How many Hz in the uk mains
      50
    • Brown wire
      Live wire
    • Blue wire
      Neutral wire
    • Green and yellow wire
      Earth wire
    • National grid - system of cables and transformers linking power station to consumers
    • Step up transformers - Increase voltage
    • Step down transformers - reduce voltage
    • Each wire in the plug is made out of copper and is covered in insulating plastic for safety
    • Whats does the live wire do
      provides alternating potential difference and has 230v
    • What does the neutral wire do
      completes the circuit by carrying current away and has 0v
    • What does the earth wire do
      stops appliance casing from becoming live by providing an alternative pathway for current to flow away
    • Earth wire doesn’t normally have a current
    • Earth wire has a potential difference of 0v
    • How does casing from a wire become live
      If live wire came loose and touched the casing
    • Which wire supplies the current to the appliance
      Live wire
    • Which wire completes the circuit allowing current to flow
      Neutral wire
    • Fossil fuel and nuclear power stations work by generating thermal energy. Water is turned into steam which can rise and spin turbines. Kinetic energy can be converted to electrical energy
    • high current causes wire to heat up meaning that energy is lost as heat to surroundings
    • Step up transformers
      • increase voltage
      • decrease current
    • High voltage
      • is dangerous
      • blows household appliances
    • Step up transformers increase voltage to 400000v
    • Step down transformers reduce voltage to 230v
    • We use low current and high voltage to reduce energy loss
    • voltmeter always connected in parrel to components
    • ammeter always connected in series with components
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