Basic Electronics Paper 2, WASSCE (PC), 2017

Question 7

               Question 7
The metal part of an electric kettle gives an electric shock when touched. State two

  1. Possible causes of the problem;
  2. Steps that should be taken in diagnosing fault;
  3. Instruments that can be used for diagnosing the fault.

 

 

Observation

           The expected answers were;

 

(a)       -           Live conductor touching the frame of the kettle
-           Poor or improper earthing.                                                             
(b)      -           Switch off the appliance
-           Unplug it from the supply
-           Test for earth continuity.
(c)       -           Insulation resistance tester (megger tester)
-           Ohmeter.
-           Multimeter (ohm range).

Many candidates who attempted this question did not do well.