CAN YOU EXPLAIN  THE MOTION ELECTRONS AND POSITIVE CHARGES(ELECTRIC CURRENT) INSIDE A WIRE CONNECTED TO A BATTERY WITH A HELP OF A DIAGRAM?AND ALSO EXPLAIN WHY CURRENT FLOWS ONLY BY CONNECTING A BATTERY (THAT IS HOW POTENTIAL DIFFERENCE WORKS IN WIRE?) 

Asked by abinash.gupta003 | 2nd May, 2017, 03:58: PM

Expert Answer:

  • 'Current' is a term that is used to describe the flow of energy, in this case, the flow of electric charge (positive charge and negatively charged electrons).
  • In its natural form, the energies have a common pattern of flow i.e. they flow from a point of higher potential (energy level) towards the point of lower potential.

  • In actuality, it is the flow of electrons (from the negative terminal of a battery to the positive terminal ) which causes the electric current to be conducted in a circuit. 
  • Whereas the direction electric energy is (theoretically) said to be from the positive terminal of the battery towards the negative terminal of the body.
  • In order to have a flow, energies need to have an energy gradient (difference in energy levels) and work is required to be done on the charge so that they flow through the circuit.
  • The potential difference of a battery provides this energy gradient along with the energy for the flow of charge.
  • Therefore, the current flows only when a battery or an external source is applied to the circuit.

  • eg. Water from an overhead tank flows down to a domestic tap only when there is a difference in the height of the tank and the tap, this difference is basically the energy gradient which resembles the concept of a potential difference of an electric circuit. The flow of water from the overhead tank is pushed down towards the tap due to the gravitational pull of the earth, this phenomenon resembles the action of a battery which supplies energy for the flow of electrons in an electric circuit.

Answered by Abhijeet Mishra | 3rd May, 2017, 10:11: AM