50 points, will give brainliest

select the correct answer from each drop-down menu.

complete the sentences to explain the features of a semiconductor.

semiconductors conduct electricity when (1. their temperature increases 2. their temperature decreases or 3. when pressure is applied on them) or when engineers add impurities to them. in led lighting, semiconductors convert (1. electrical 2. chemical or 3. heat) energy into light in a process called electroluminescence.