سوال ۱۶ کنکور ارشد مهندسی برق ۱۴۰۵

PASSAGE 2 — Paragraph 1:

Early investigations of static electricity go back hundreds of years. Static electricity is a transfer of electrons produced by friction, like when you rub a balloon across a sweater. A spark or very brief flow of current can occur when charged objects come into contact, but there is no continuous flow of current. In the absence of a continuous current, there is no useful application of electricity. The invention of the battery, a breakthrough which could produce a continuous flow of current, made possible the development of the first electric circuits. Alessandro Volta made the first battery, the voltaic pile, in 1800. The very first circuits used a battery and electrodes immersed in a container of water. The flow of current through the water produced hydrogen and oxygen.

16 — Which of the following is NOT mentioned in paragraph 1?