The correct answer is: D. any of the above size
Aluminium is a good conductor of electricity, but it is not as good as copper. However, aluminium is much lighter than copper, so it can be used to make transformers that are smaller and lighter than those made with copper. This can save money on the cost of materials and on the cost of shipping the transformers.
In addition, aluminium is less expensive than copper, so using aluminium in transformers can also save money on the overall cost of the transformers.
Therefore, aluminium can be used to make transformers of any size, and it can save money on the cost of the transformers regardless of their size.
Here is a brief explanation of each option:
- A. small size: Aluminium can be used to make small transformers that are lighter and less expensive than those made with copper.
- B. medium size: Aluminium can be used to make medium-sized transformers that are lighter and less expensive than those made with copper.
- C. large size: Aluminium can be used to make large transformers that are lighter and less expensive than those made with copper.
- D. any of the above size: Aluminium can be used to make transformers of any size, and it can save money on the cost of the transformers regardless of their size.