Science - Electricity in the Home

The flashcards below were created by user mshowley on FreezingBlue Flashcards.

  1. State the unit used to measure the units of electricity in the home
    Kilowatt hour (kW)
  2. State the pin that the brown wire is connected to in a plug
    Live
  3. State the pin that the blue wire is connected to in a plug
    Neutral
  4. State the pin that the green and yellow wire is connected to in a plug
    Earth
  5. Explain alternating current
    This means the electrons in the wire are constantly changing direction
  6. Explain direct current
    This means the electrons in the wire are flowing in one direction only
  7. What is a diode?
    This allows current to flow in one direction only
  8. When the positive end of the diode is connected to the positive end of the battery what happens?
    It is said to be in forward bias and this allows current to flow
  9. When the negative end of the diode is connected to the positive end of the battery what happens?
    It is said to be in reverse bias and no current flows
  10. What is an LED?
    This means light emitting diode

    It gives off light when current flows through it

    It is used to show if devices are on or off
  11. What is a thermistor?
    This is a device made of a material that reduces its resistance when the temperature of the device changes

    They are used as temperature sensors in fire alarms, ovens and fridges
  12. What is an LDR?
    This means light dependent resistor

    It is a variable resistor that changes resistance in response to light

    They are used as light meters in cameras and to turn on street lights
  13. When light is shone on an LDR does the resistance increase or decrease?
    It decreases
  14. State the function of a fuse
    This is a safety measure that if the current flowing through it is to high, the fuse wire melts breaking the circuit and cuts off the electricity
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152352
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Science - Electricity in the Home
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Electricity in the Home
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