The sentences in the following paragraph have been purposely placed in the wrong order. Examine key terms and transitional devices, and then rearrange the sentences so that the paragraph moves smoothly and logically from one sentence to the next. Indicate the correct order of the sentences by placing the sentence numbers in the order in which the sentences should appear. Briefly explain why you chose that particular order.(1) If such improvements could be achieved, the consequences would be significant for many different applications. (2) However, the most challenging technical problem is achieving substantial increases in the quantities of electrical energy that can be stored per unit weight of the battery.
(3) The overall process yields about 70 percent of the electricity originally put into the battery.
(4) A storage battery is a relatively efficient way of storing energy.

Rearrangement of the sentences so that the paragraph moves smoothly and logically from one sentence to the next:

(4) A storage battery is a relatively efficient way of storing energy.

(3) The overall process yields about 70 percent of the electricity originally put into the battery.

(2) However, the most challenging technical problem is achieving substantial increases in the quantities of electrical energy that can be stored per unit weight of the battery.

(1) If such improvements could be achieved, the consequences would be significant for many different applications.

Explanation:

A paragraph must have a main topic, which is captured in the topic sentence.  This main sentence puts forward the thesis or the claim that is being made by the author.  This is closely followed with supporting evidence and examples.  The author can then introduce a counterclaim. Every good paragraph follows some logical patterns to convey the intended information to the readers.  

answer; blank(1); /// whitelisting; blank(2); // blacklisting;