How do you define electrical resistance?

Electrical resistance is the opposition offered by a material to the flow of electric current. It determines how easily or difficultly electrons can move through a conductor.

Symbol and unit:

• Symbol: R
• SI unit: Ohm (Ω)

Formula (from Ohm’s Law):
R = V / I
Where:

• V = voltage
• I = current

Factors affecting resistance:

• Length of conductor: Longer length → higher resistance
• Cross-sectional area: Thicker wire → lower resistance
• Material: Conductors (like copper) have low resistance, while insulators have high resistance
• Temperature: Resistance usually increases with temperature in conductors

Practical understanding:
Resistance acts like a restriction in a wire, controlling how much current can flow in a circuit.

In simple terms:
Electrical resistance is the property of a material that resists or slows down the flow of electric current.