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Resistance

Electric current is the flow of electrons. As these electrons flow around a circuit they bump into the atoms in the conducting wire and electrical components. These constant collisions make it difficult for the current to flow or in other words resist the electrical current.

Therefore,

Resistance is the property of an object or substance of resisting or opposing the flow of electrical current.
Resistance is measured in units called “Ohms”
and has the symbol Ω