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3 marksElectrical Circuits

CAPE Physics Unit 2 · 2013 · Paper 2 · Question 1(c)(ii)

An ammeter is inserted at Y to monitor current I and a voltmeter monitors terminal voltage V_T as R1 is adjusted, yielding the data in Table 1.

The slope, S, of the graph is related to the internal resistance, r, by S = -1/r Ω^-1. Find S and hence determine the internal resistance, r, of the battery.

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Other parts of this question

  1. 1(a)With the aid of a diagram, derive the formula for the equivalent resistance of two resistors in parallel.[6 marks]
  2. 1(b)(i)Calculate the equivalent resistance, R_eq, in Figure 1B.[2 marks]
  3. 1(b)(ii)Determine the voltage, V2.[1 mark]
  4. 1(c)(i)Use the results in Table 1 to plot a graph of I against V_T on the grid provided.[3 marks]

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