Question

What is a battery? How will you make a battery of 9 volt if you have cells of 1.5 volt each?

Answer 1

a battery is a device which supply's voltage or supply potential difference btw two points

by one battery -ve to other cell + ve side then it comes like +ve cell-ve to +ve cell -ve to +ve cell-ve to +ve cell-ve so all connected
flow from +ve to -ve

so 1.5v *6cells =9v