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1 markCapacitors

CAPE Physics Unit 2 · 2012 · Paper 2 · Question 4(a)(iii)

A section examining capacitor definitions, formulas, and an emergency flasher circuit.

State what is meant by the term 'time constant' for a capacitor discharge circuit.

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Other parts of this question

  1. 4(a)(i)Define the terms 'capacitance' and 'farad'.[2 marks]
  2. 4(a)(ii)a)Write an expression for the net capacitance of three capacitors C1, C2, C3 connected in series.[1 mark]
  3. 4(a)(ii)b)Write an expression for the net capacitance of three capacitors C1, C2, C3 connected in parallel.[1 mark]
  4. 4(b)(i)a)Calculate the time between flashes (time for the uncharged capacitor to reach 110 V from a 120 V supply via 1.0 MΩ and 1.0 μF).[2 marks]
  5. 4(b)(i)b)Calculate the duration of each flash, given discharge through 10 Ω takes three time constants.[2 marks]
  6. 4(b)(i)c)Calculate the energy released in each flash.[2 marks]
  7. 4(b)(ii)It is claimed that during the flash, the light is as bright as that from a 200 W light bulb. Comment on this statement.[4 marks]

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