This is a complete sentence. It paints a complete picture in the reader's mind.

This is a complete sentence. It paints a complete picture in the reader's mind.

This is a fragment.  

In this example, the word "whereas" sets up a comparison. The reader expects to learn something about another beacon that is different from the new beacon.

To fix it, add information:

The new beacon's signal was strong and steady, whereas the old beacon produced a weak signal.

This is a fragment.  

In this example, the words do not include an action word (verb), so the reader cannot form a complete picture of what should happen.

To fix it, add an action word:

Safety gear, such as high-intensity face shields, protects welders from flying sparks.

This is a fragment.  

In this example, the word "Although" implies that something did not happen. The reader is left with the question, "What did not happen despite the extra work he did?"

To fix it, add information:

Although he worked extra shifts during the busiest months, he did not earn enough to buy a new car.

This is a fragment.  

In this example, the word "Because" implies that something good will result from the team's work, but the reader does not know what that result will be.

To fix it, add information either at the beginning or at the end:

Because the team met the annual quota, we received an extra vacation day.

Or:

The company awarded bonuses because the team met the annual quota.

This is a complete sentence. It paints a complete picture in the reader's mind.

This is a complete sentence. It contains a subject ("electrical wiring") and a verb/action word ("is") and it expresses a complete idea. 

This is a fragment.  

In this example, the word "besides" implies that there is something else to consider.

To fix the sentence, add information and/or re-arrange the words: Besides using fabricated metal parts, the company uses molded plastic pieces.