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.
Best Answer: An AA battery (pronounced [double a] or /ËdÊbÉl eÉª/) is a dry cell-type battery commonly used in portable electronic devices. The AA battery type was standardized by ANSI in 1947, and is designated E91 by DIN and AM3 by JIS. Internationally the IEC designated it as LR6 (alkaline), R6 (carbon-zinc), KR157/51 (nickel-cadmium), HR6 (nickel-metal-hydride), and FR6 (lithium-iron-disulfide). Other names include MN1500 and HP7. In China it is known as the #5 battery. In Germany it is known colloquially as Mignon. An AA battery is composed of a single electrochemical cell. A AAA battery (pronounced triple A) is a dry cell-type battery commonly used in portable electronic devices.