waecE-LEARNING
Basic Electricity Paper 2 , May/June 2014  
Questions:   1 2 3 4 5 6 7   Main
General Comments
Weakness/Remedies
Strength
















Question 7
  1. Sketch the sine waves of two voltages V1 and V2 with V1 lagging V2.
  2. The waveform of a voltage has a peak value of  4.0 kV.  Calculate the:

(i)    average value;

(ii)   rms value of the voltage
_____________________________________________________________________________________________________
Observation

The expected answers were:
                        (a)                                 


                         
                         (b)       (i)         average value = 0.637 x peak value                                                   
                                                                       = 0.637 x 4 x 103 = 2.55 kV                                       
                                    (ii)        r.m.s. value = 0.707 x peak value                                                       

                                                                    = 0.707 x 4 x 103 = 2.83 kV      

The question was on Alternating Current Circuit Theory. Many candidates who attempted this question performed very well.  The performance was reported good.

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