Current

Current is rate of flow of charges per unit time .

It means if we have more electrons flowing from a conductor per unit time , we will have more current .

Mathematically it is represented as

The unit of current is ampere

Normally current is transferred from one end to another, through wires. Current behavior can be considered as the water flowing in a water pipe

Voltage and Electric Field.

We know that charges move under the influence of electric field. This field is provided by providing different voltages at different points. The difference between these voltages gives us potential difference (voltage) which causes electrons accelerate from higher potential to lower potential.

Similarly voltage can be calculated as taking difference of two potentials. Lets say in the below figure we need to find Vab

Similarly we can find voltage as

Hence it is the amount of energy required to move electrons (q) in a particular time