Quelpr
3 marksElectrical Circuits

CAPE Physics Unit 2 · 2006 · Paper 2 · Question 6(d)(i)

Find the potential at the non-inverting terminal of the op-amp in Figure 8.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 6(a)(i)Explain why the scales on the axes are logarithmic rather than linear.[1 mark]
  2. 6(a)(ii)What value does the graph give for the open loop gain of the op-amp.?[1 mark]
  3. 6(b)(i)Use the graph to determine its bandwidth.[1 mark]
  4. 6(b)(ii)Draw a circuit diagram to show how the non-inverting amplifier could be constructed.[2 marks]
  5. 6(b)(iii)Write the formula for the gain of this amplifier.[1 mark]
  6. 6(b)(iv)State the ratio of the feedback resistance to resistance of the input resistor in this non-inverting amplifier.[2 marks]
  7. 6(c)Using your answer to (a) above determine the maximum input voltage to the op-amp. if it is not saturated.[2 marks]
  8. 6(d)(ii)In the dark the resistance of the light-dependent resistor (ldr) is 400\text{ k}\Omega. Find the potential at the inverting terminal in this situation and…[4 marks]
  9. 6(e)The led in the circuit is rated 2.4\text{ V}, 25\text{ mA}. A protective resistor has to be connected in series with it so that it does not burn out. What…[3 marks]

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