(i)  1Ampere of current means 1 Coloumb Of charge flowing through a conductor in 1 Second.

Also 1 Ampere of current May be defined as the current flowing through two parallel conductors in same direction when they are separated by 1 metre and they experiences a force of 1 N/cm by virtue of each other.

(ii) One volt is defined as energy consumption of one joule per electric charge of one coulomb. 1V = 1J/C.

OR

One Volt is defined as energy consumption of one joule per electric charge of one

coulomb.

(iii) Ohm's LAW : It states that "Physical condition remaining same, the current flowing through a conductor is directly proportional to the potential difference across its two ends". i.e., V = IR where the constant of proportionality R is called the electrical resistance or resistance of the conductor

(iv) Charge is the property of matter which enables it to experience a force when placed in an electric or magnetic field.

The SI unit of charge is coulomb (C). 
1C is the charge carried by  6.025 * 10^-19 electrons