When you are finished, you should be able to: 1  State the role of a helping verb and list some examples. 2  Explain how helping verbs can clarify the verb tense of a sentence. 3  Identify helping verbs in a sentence.
The dry cell battery is one of the most commonly used types, including AA, 9-volt, and watch batteries. Dry cell batteries are different from wet cells because their electrolytes are contained in a low-moisture paste, while a wet cell has electrolytes contained in a liquid, hence the difference in names.
A battery eliminator circuit (BEC) is an electronic circuit designed to deliver electrical power to other circuitry without the need for multiple batteries. Historically the expression was sometimes used to describe devices used to power battery-driven equipment from mains electricity.