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Defend Earth from alien invaders
North, South Poles
The two magnetic poles.
The two kinds of electric charge.
A fundamental property of matter that can be either positive or negative.
A tiny imbalance between positive and negative charge on an object
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 electric potential energy.
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