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1 markElectricity, Lighting and Safety

CSEC Integrated Science · May/June 2011 · Paper 2 · Question 4(a)(ii)

A test circuit is used to examine electrical conductivity of materials: aluminium, carbon, copper, plastic, rubber, wood.

Choose ONE very good electrical insulator from the provided list.

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Other parts of this question

  1. 4(a)(i)Choose TWO very good electrical conductors from the provided list.[2 marks]
  2. 4(b)(i)Calculate the total voltage of the battery consisting of four dry cells connected in series, if each cell provides 1.5 V.[1 mark]
  3. 4(b)(ii)State the reading on the ammeter in Figure 5a when the switch is open.[1 mark]
  4. 4(b)(iii)State how the ammeter reading changes when a conducting wire is connected across terminals X and Y with the switch closed.[1 mark]
  5. 4(b)(iv)Cherise places a 2 ohm resistor between X and Y and closes the switch; the voltmeter across it reads 4 V. State the formula used to calculate current.[1 mark]
  6. 4(b)(v)Calculate the current in the circuit using the values from (iv), stating the correct unit.[2 marks]
  7. 4(b)(vi)Give ONE reason why it is beneficial to include a fuse in this circuit.[1 mark]
  8. 4(c)(i)State ONE precaution to prevent electrical shock or fire when connecting the radio to an outlet.[1 mark]
  9. 4(c)(ii)State a SECOND precaution to prevent electrical shock or fire when connecting the radio to an outlet.[1 mark]
  10. 4(d)Identify the most appropriate type of fire extinguisher for extinguishing an electrical fire.[1 mark]
  11. 4(e)(i)Name ONE item of protective clothing/gear worn by fire fighters.[1 mark]
  12. 4(e)(ii)Name a SECOND item of protective clothing/gear worn by fire fighters.[1 mark]

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