Define: i) Ampere ii) Volt
i) Ampere: One ampere current is said to be flowing through a conductor /wire if at any section of it, one coulomb of charge passess in one second. It is the unit of current.
ii) Volt: A body is said to have an electric potential of one volt if one joule of work is required to transfer a charge of one coulomb to the body. It is the unit of potential difference.