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3 marksElectrical Circuits

CAPE Physics Unit 2 · 2002 · Paper 2 · Question 5(b)

A parallel combination of rheostats R1 and R2 is used for current control (Figure 7), where the total resistance of R1 is 25 times that of R2. Describe the procedure to adjust the circuit current I to a desired value.

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Other parts of this question

  1. 5(a)(i)Derive an expression for the equivalent resistance of THREE resistors connected in parallel.[3 marks]
  2. 5(a)(ii)Distinguish between the electromotive force of a cell and the terminal potential difference across a cell.[2 marks]
  3. 5(c)(i)Calculate the resistance of the voltmeter.[4 marks]
  4. 5(c)(ii)Calculate the voltmeter reading when connected across A'B' in Figure 8(ii).[5 marks]
  5. 5(c)(iii)State what the results suggest concerning the use of voltmeters in electrical circuits.[3 marks]

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