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An electric current is a flow of microscopic particles called electrons flowing through wires and electronic components. It can be likened to the flow of water through pipes and radiators, etc.
Here’s a simple and interesting experiment that you can try out. Bring a plastic comb near some tiny pieces of paper. What happens? Nothing; the comb will not have any effect on them. Now rigorously rub the comb against a dry piece of cloth and bring it close to the tiny pieces of paper. You will notice that the comb attracts the pieces of paper towards itself. This happens not by magic. There is a clear and logical explanation for such an observation. 
Initially the comb is electrically neutral. So it has no effect on the tiny pieces of paper. When the comb is rubbed on a dry cloth, it gets electrically charged. This charged comb exerts an electric force on the tiny pieces of paper and attracts them. A glass rod rubbed with a silk cloth and an ebonite rod rubbed with a woollen cloth also acquires the ability to attract small pieces of paper and are said to possess an electric charge.
Types of Electric Charges
  1. Opposite charges attract each other. For example, a positive charge attracts a negative charge.
  2. Like charges repel each other. For example, a positive charge repels a positive charge and a negative charge repels a negative charge.

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