Question

Which of the following is the correct relationship between the voltage of a cell and specific gravity in an open volt test?

(a) The voltage of cell=Specific gravity +.840

(b) The voltage of cell=Specific gravity -.840

(c) Specific gravity =voltage of the cell +12

(d) Specific gravity =voltage of the cell -12

I got this question in homework.

Origin of the question is Battery Testing topic in portion Storage Batteries of Automotive Engine Design

Answer 1

The correct answer is (a) The voltage of cell=Specific gravity +.840

Best explanation: In an open volt test a change of 0.01 volt of open-circuit voltage is equivalent to a change of 0.010 in the specific gravity of the electrolyte. The relationship between the open-circuit voltage of a battery and its specific gravity is Voltage of the cell =specific gravity +.840.