DC Network

 1. Define electric current?

Ans: The valence electrons in different atoms of a material are free to move from one point to other. When an electron field is applied to a conductor the motion of electrons gets channelized. More electrons flow in one direction than in the other. The rate of flow of electrons is called current.

I= (dq/dt)

2. Define potential difference?

Ans: Absolute potential of a point is the work done in moving a unit positive charge from infinity to that point. The potential difference between two points is the work done in moving a unit positive charge from one point to the other. It measured in volts.

3. Define the word "Resistance"?

Ans: Electric current in a conductor consist of movement of electrons. When electrons flow through a material, they collide with other atomic particles and energy is lost in these collisions. The energy lost per unit charge is the voltage drop. The ratio of voltage drop to current is the resistance of material.