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2 marksAlternating Currents

CAPE Physics Unit 2 · 2001 · Paper 1 · Question 4(b)

For the waveform represented in Figure 4, write an equation which represents how the alternating current, I, varies with time, t.

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Other parts of this question

  1. 4(a)(i)Find the amplitude of the current.[1 mark]
  2. 4(a)(ii)Find the period of the alternating current.[1 mark]
  3. 4(a)(iii)Find the frequency of the alternating current.[1 mark]
  4. 4(c)(i)Sketch a graph to show how the current varies as it flows through the resistor.[2 marks]
  5. 4(c)(ii)To smoothen the rectified potential difference across the resistor, a capacitor is placed in the circuit of Figure 5. Indicate on Figure 5 where you would…[1 mark]
  6. 4(c)(iii)Show on the graph sketched in part (c)(i) the effect on the current of placing the capacitor in the circuit.[1 mark]
  7. 4(c)(iv)On the sketched graph, label the region where the capacitor is being charged.[1 mark]

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