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From simple to complex.

1. The restriction is resistance: low reistance, small restriction, high resistance, large restriction.

2. Availability of charge carriers: metals have many free electrons, so they convey electric currents well and offer little restriction - low resistance.

3. Scarcity of charge carriers: non-metals (water, wood, rubber plastics, glass) have few free electrons, so they offer large restriction to the attempt to carry an electric current: high resistance.

4. Consider the diameter (cross-section area) of a conductor, and how increasing the area would affect resistance.

5. Consider the length of a conductor, and how increasing the length would affect resistance.

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11y ago

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