Give some sources of potential difference (P. D) that you know.
One example of a rechargeable source of P. D.

Give one example of a source of P. D. which is used once and finally thrown away

All type of Batteriessecondary batteries ( Rechargeable battery) example car battery etc . these battery contain Sulphuric acid as there electrolytic Primary Battery (Non Recharge) example Dry cell , pencil cell . These battery contain chemicals they react when we use the battery and can't be recharged again we need to replace each and every time

Nucleus for question ome

Definitely the indoraptor