why does an electric cell have two terminals

An electric cell has two terminals, one negative and one positive, because, current cannot pass to only one side. It can only travel through two opposite sides.

An electric cell has two terminals, one negative and one positive, because, current cannot pass to only one side. It can only travel through two opposite sides.

k why are you writing the answer again you can simply give a thumbs up to the first answer .

to form an electric circuit two terminals are required
it is being closed and electric current passes through it

so the instrument could have more power to work

For the completion of an electric circuit two terminals are required . That is the reason why cells have  two terminals to allow the current to pass and complete the circuit so that the device works .