Basic Electricity 2, WASSCE (SC), 2018

Question 5

 

  • State three advantages for electrical transmission at high voltages.
  • State the voltage values of:
  • single phase distribution;
  • three phase distribution.

Observation

The expected answers were;

  1. Reasons for transmission at high voltages:

 

  • Standardization of frequency and voltages.
  • Better voltage regulation.
  • Transmitting very large power over long distances
  • Reduction of power loss
  • Reduction of transmission cost
  • Improved rate of transmission

         

  • (i)   Single phase   -  240V

(ii)  Three phase    - 415V                  

         Many candidates who attempted this question performed well which indicates good understanding of the topic.