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The two kinds of magnetic poles.


The two kinds of electrical charges.

Electric charge

A fundamental property of matter that can be either positive or negative.

Static electricity

A tiny imbalance between positive and negative charge on an object.

Electric charge

A flow of tiny particles that carries electrical energy In wires and machines. The particles ( usually electrons) are typically much smaller than atoms and can flow around and between atoms even in solid matter.


The unit of electric current.


The unit of potential energy.

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