Electronics Circuit

Voltage

 Voltage is a representation of the electrical potential energy per unit charge. if a unit of electrical charge were placed in a location, the voltage indicates the potential energy of it at the point . in orders words, it is a measurement of the energy contained within a electric field or an electric circuit at a given point.

 Voltage is a scalar quantity the SI unit of the voltage is the volt,

   such that  1 volt = 1 joule / coulomb. 

Current:

Electric current is a flow of charge through a media. This type of charge is typically  carried by moving electron in a  wire. The SI unit of current is Ampere . measured by ammeter in series of the circuit.

I = Q/T.

or movement of free electron is called current.