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P4: Supplying energy

Quiz by Oxford Revise Physics

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19 questions
Show answers
  • Q1
    Why is the current provided by a cell called a direct current (d.c.)?
    flows directly from the mains socket
    only flows in one direction
    flows alternately in different directions
    flows from a chemical energy store
    60s
  • Q2
    What is an alternating current (a.c.)?
    current supplied by an alternative energy resource
    flows and stops repeatedly in the circuit
    current that repeatedly reverses direction
    the current flows backwards around the circuit
    60s
  • Q3
    What kind of current is supplied by mains electricity?
    negative current
    alternating current
    direct current
    stable current
    60s
  • Q4
    30s
  • Q5
    What colour is the live wire in a three-core cable?
    brown
    green and yellow stripes
    red
    blue
    60s
  • Q6
    What colour is the neutral wire in a three-core cable?
    black
    blue
    brown
    green and yellow stripes
    60s
  • Q7
    What colour is the earth wire in a three-core cable?
    brown
    green and yellow stripes
    black
    blue
    60s
  • Q8
    What is the function of the live wire in a three-core cable?
    carries the direct current to the appliance
    safety wire to stop the appliance becoming live
    completes the circuit
    carries the alternating potential difference from the supply
    60s
  • Q9
    What is the function of the neutral wire in a three-core cable?
    carries the alternating potential difference from the supply
    safety wire to stop the appliance becoming live
    carries the direct current to the appliance
    completes the circuit
    60s
  • Q10
    What is the function of the earth wire in a three-core cable?
    completes the circuit
    carries the direct current to the appliance
    carries the alternating potential difference from the supply
    safety wire to stop the appliance becoming live
    60s
  • Q11
    When is there a current in the earth wire?
    there is never a current in the earth wire
    when the appliance is off but the mains switch is on
    when there is a fault
    when the appliance is on
    60s
  • Q12
    Why is the live wire dangerous?
    provides a large p.d. that would cause a large current to flow through a person
    provides a large direct current that would cause a large current to flow through a person
    has a high resistance so gets very hot
    the live wire is always on
    60s
  • Q13
    What is the nationwide network of cables and transformers that link power stations to customers called?
    National Guard
    National Grid
    Grand National
    National Network
    60s
  • Q14
    Transformers can be step-up or step-down. Which type of transformer increases the current from the power station to the transmission cables?
    step-down
    step-up
    60s
  • Q15
    Transformers can be step-up or step-down. Which type of transformer decreases the p.d. from the transmission cables to the mains supply in buildings so that it is safe to use?
    step-down
    step-up
    60s

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