Electrical Engineers Are Attempting to Maximize the Efficiency of an Experimental

Multiple Choice

Electrical engineers are attempting to maximize the efficiency of an experimental battery cell.They wish to determine the optimum charge rate that will provide the maximum battery capacity.They sample 50 cells and randomly assign five different charge rates to the sample (10 cells for each charge rate) .All cells are then discharged at the same rate, with the total battery capacity being recorded in amp-hours.The variable controlled in this experiment is:

A) all experimental battery cells.
B) the different charge rates.
C) the total capacity recorded in amp-hours.
D) the 50 sampled cells.