Basic Electricity 2, WASSCE (SC), 2021

Question 3

 

  1. Define the following terms:
    1. Current rating;
    2. Fusing current;
    3. Fusing factor.
  2. State two methods of:
    1. Wiring;
    2. Earthing.

 

Observation

The expected answers were;

 

  1. Definition of Terms:

(i) Current rating: This is the maximum current that a load will carry indefinitely without undue deterioration.
(ii)  Fusing current: This is the current at which the fuse blows or the fuse element melts.
(iii) Fusing factor: This is the ratio of the fusing current to the current rating of the fuse.

  1. (i)      Methods of Wiring
    • Surface
    • Conduit
    • Trunking
    • Ducting

(ii)       Methods of earthing

    • Rod
    • Mesh
    • Plate
    • Pipe
    • Mat

     

Many of the candidates who attempted this question did well by defining the terms required and stated the methods of wiring and earthing.