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1 markElectrical Circuits

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

Figure 1A is a potential divider circuit splitting 32 V into V1 and V2, with R1 = 33 Ω variable resistor set at Y, and parallel resistors R2 = 8 Ω and R3 = 12 Ω. Figure 1B shows the equivalent circuit.

Determine the voltage, V2.

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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(c)(i)Use the results in Table 1 to plot a graph of I against V_T on the grid provided.[3 marks]
  4. 1(c)(ii)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.[3 marks]

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