Quelpr
2 marksAlternating Currents

CAPE Physics Unit 2 · 2003 · Paper 2 · Question 7(a)(ii)

Alternating voltages and currents.

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 maximum value of 2.60 A.

The mark scheme is shown once you've answered.

Practise this question

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(b)Explain the operation of an ideal transformer when a small alternating voltage is supplied to its primary winding.[7 marks]
  3. 7(c)(i)Calculate the turns ratio, N_p / N_s, of the transformer.[2 marks]
  4. 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]
  5. 7(c)(iii)Calculate the resistive load in the secondary circuit of the transformer.[3 marks]

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