Answer:
Voltage difference is 13 volts
Step-by-step explanation:
If voltage A ([tex]V_A[/tex]) is -8 volts, and voltage B ([tex]V_B[/tex]) is 5, the voltage difference is calculated via the formula
[tex]V_B-V_A=5\,volts \,- \,(-8 \,volts)=5\, volts\,+\,8\, volts=13\,volts[/tex]
When estimating a difference between quantity A and another quantity B it is custom to perform the difference built as the last quantity mentioned, minus the first one.
