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3 marksElectrical Circuits

CAPE Physics Unit 2 · 2003 · Paper 2 · Question 7(c)(iii)

A transformer on a utility pole operates at 8.5 kV_rms on the primary side and supplies electrical energy to nearby houses at voltage of 120 V_rms. Assume that the transformer is ideal.

Calculate the resistive load in the secondary circuit of the transformer.

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Other parts of this question

  1. 7(a)(i)State the relationship between peak voltage, V_p, and root mean square voltage, V_rms, for an alternating sinusoidal voltage.[1 mark]
  2. 7(a)(ii)Calculate the value of the direct current that will produce the same quantity of thermal energy in a particular resistor, as an alternating current that has a…[2 marks]
  3. 7(b)Explain the operation of an ideal transformer when a small alternating voltage is supplied to its primary winding.[7 marks]
  4. 7(c)(i)Calculate the turns ratio, N_p / N_s, of the transformer.[2 marks]
  5. 7(c)(ii)The average rate of energy consumption in the houses served by the transformer is 78 kW. Calculate the peak value of the current in BOTH windings of the…[5 marks]

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