Basic Electricity 2, WASSCE (PC 2ND), 2019

Question 5

 

  1. With the aid of a sketch, state how the range of an ammeter can be extended to read a higher value.
  2. List three devices of a moving-coil instrument.
  3. State two advantages of digital measuring instrument over moving-coil measuring instruments

Observation

The expected responses were:

 

  1.  

  2. Devices of a moving-coil instrument
    • • Operating device
    • • Controlling device
    • • Damping device
  3.  

  4. Advantages of digital measuring instruments over moving coil instruments
    • • Output display is easier to read
    • • Readings are more accurate
    • • There are no moving parts
    • • It is more user friendly

 

Many candidates who attempted this question did the extension well, managed to list advantages but could not list the devices.