Question

why an electric bulb and an electric cell have two terminals

Answer 1

because they can connect to other opp. terminal and glow may be

Answer 2

hi friend
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your answer
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An electric bulb and an electric cell have two terminals because one terminal is positive and another terminal is negative. In an electrical circuit, current flows from the negative terminal to the positive terminal.
Hope it helps
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REGARDS
#SethRollins1