Share
Explore BrainMass
Expert Profile
Offline

# John Rampton

107934
Sep 2010
• Responses: 296
• eBooks: 1

## Education

• 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

## eBooks

### Everything You Need to Know About 1st Order Differential Equations

This book describes the main methods used to analytically solve first order ordinary differential equations (ODE). First order ODE equations are introduced including details of their classification by order and degree. The main analytical, techniques are then presented with a number of worked exampl READ MORE »

## Solution Library

### 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

### Write down an expression for the voltage waveform, and sketch the waveforms of the harmonic components.

An a.c. voltage, V, comprises of a fundamental voltage of 100 V rms at a frequency of 120 Hz, a 3rd harmonic which is 20% of the fundamental, a 5th harmonic which is 10% of the fundamental and at a phase angle of 1.2 radians lagging.

(i) Write down an expression for the voltage waveform.

Engineering / Electrical Engineering » 366169

### 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

### 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