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6 marksElectrical Circuits

CAPE Physics Unit 2 · May/June 2022 · Paper 2 · Question 1(a)(ii)

This question explores electrical circuits with resistors in series and parallel, and the analysis of current and resistance.

Using the diagram in (a)(i), derive the formula for the effective resistance of the THREE resistors in series.

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Other parts of this question

  1. 1(a)(i)Draw a circuit diagram showing THREE resistors, R1, R2 and R3, placed in series connected to a power supply. On your diagram, label the voltages and the…[4 marks]
  2. 1(b)Calculate the current I_L through the variable resistor R_L, when R_L has a value of 30 Ω.[10 marks]
  3. 1(c)(i)Complete Column 3 in Table 1.[2 marks]
  4. 1(c)(ii)On the grid provided in Figure 2 on page 9, plot a graph of I_L versus [1 + (R_L / 6)]^-1. Draw the line of best fit through the points.[4 marks]
  5. 1(c)(iii)Use the graph in (c)(ii) to determine the value of I_E.[4 marks]

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