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2 marksOperational Amplifiers

CAPE Physics Unit 2 · 2007 · Paper 2 · Question 2(b)(iii)

Determine the temperature at which the LED turns on as the temperature is increased from 40 °C.

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Other parts of this question

  1. 2(a)Plot a graph of resistance R against temperature θ on the grid provided.[4 marks]
  2. 2(b)(i)Use your graph to determine the resistance of the thermistor at 75 °C.[1 mark]
  3. 2(b)(ii)State, with reasons, whether the LED will be ON or OFF when the temperature of the thermistor is 75 °C.[3 marks]

More practice: the rest of this paper · more Operational Amplifiers questions · all CAPE Physics Unit 2 past papers