what is the range of resistance between which electric current can flow ?
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Answers
Only very special substances, called superconductors (they're actually special substances placed in special situations, namely extreme cold) offer no resistance to the flow of electric current. All other substances resist the flow current to some degree.
Because of the way that electrons are arranged around their nuclei, metals tend to be excellent conductors. Some, like copper (Cu), silver (Ag) and gold (Au) are better than others, like lead (Pb), but all resist the flow of electric charge (current) to some degree.
Electrical resistance of a material is a property of that material, and its size and temperature. It is a result, like most of physics and all of chemistry, of the way electrons behave when bound to atoms.
If you know a bit about chemistry, the conducting properties of metals arises from how their electrons in d-orbitals arrange and behave in bulk materials.
Unit of resistance: Ohms
The unit we use to measure and compare electrical resistance in materials and in electrical and electronic circuits is the Ohm, defined in the box and referred to by the Greek letter omega.
Resistance can range from a few pico-Ohms (1 pΩ = 1 × 10-12Ω) in good conductors to many Giga-Ohms (1 GΩ = 1 × 109 Ω) in insulators.
The base units of Ohms (1 Ω = 1 Kg·m2s-3A2) seem a bit complicated, but you generally won't need them except in special situations. For now, just know the rough range of resistance for conductors and insulators. We'll use Ohms a lot to do circuit calculations.
By the way, Ohms is capitalized because it's a person's name: Georg Simon Ohm.