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John Rampton

Sep 2010
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  • M.Sc, University of Surrey, UK, 2008
  • M.Eng, Open University in the UK, 2004
  • B.Sc (hons) 2(2), Leicester University in the UK, 1985


  • Engineering
  • Physics
  • Mathematics
  • Chemistry

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General Electrical Engineering Questions

1. For the circuit given in FIGURE 1 the power factor is 0.72 lagging and the power dissipated is 375 W.
FIG. 1 (see attachment)
Determine the:
(i) apparent power
(ii) reactive power
(iii) the magnitude of the current flowing in the circuit
(iv) the value of the impedance Z and state whether READ MORE »

Engineering / Electrical Engineering / Electronic Engineering » 589000

Fourier analysis using Excel

The supply current was sampled 1024 times over a very short time interval. The data so obtained is given in column B of the accompanying Excel worksheet (see attached).
This worksheet has been set up to give a graph showing the spectral components of the data.

Question 3
i) Obtain the Fourier READ MORE »

Engineering / Electrical Engineering / Electronic Engineering » 590522

Laplace Circuit Analysis

Please give a full and simplified answer to all parts of question 6 to aid me with revision.

When a force F is applied across the face of the crystal, the current is generated. The interconnecting cable can be represented by a lumped capacitance CC. The input resistance of the amplifier, RL, acts READ MORE »

Engineering / Electrical Engineering / Electronic Engineering » 590523

Damping factor, Damped frequency, Natural frequency

For the waveform shown in attached figure, estimate
(a) the damping factor,
(b) the forced or damped frequency of oscillation, and
(c) the natural or undamped frequency.

Engineering / Electrical Engineering » 404100
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