How was the invention of the wheel important to the Summerians? A. It allowed them to conquer neighboring states. B. It made tra
veling with traded items easier and increased trade. C. It improved their communication and recordkeeping. D. It helped them to water their crops all year.
Answer: A battery or an emf device creates an electric force field that moves electrons through a circuit. The emf device has two terminals, a positive terminal called anode and negative terminal called cathode.
