The correct answer is: B. 60%
An Edison cell is a type of primary cell battery that was invented by Thomas Edison in 1899. It is a non-rechargeable battery that uses a zinc anode, a manganese dioxide cathode, and a potassium hydroxide electrolyte. Edison cells are known for their high capacity and long life.
The ampere-hour efficiency of a battery is a measure of how much electrical energy
it can deliver per unit of weight. The ampere-hour efficiency of an Edison cell is typically about 60%. This means that for every 100 ampere-hours of electrical energy that an Edison cell can deliver, it will also weigh about 100 grams.The other options are incorrect because they are not realistic values for the ampere-hour efficiency of an Edison cell. Option A, 40%, is too low. Option C, 70%, is too high. Option D, 80%, is not realistic because it is higher than the theoretical maximum efficiency of a battery.
In conclusion, the correct answer to the question “On the average the ampere-hour efficiency of an Edison cell is about” is B. 60%.