The opposition of a material to the flow of charge through it. Measured in ohms ( ).
Materials with very high resistance do not readily allow charges to flow through them. These materials can be considered good insulators. Materials with low resistance readily allow charges to flow through them. These materials can be considered good conductors.
Several factors affect the resistance of a conductor. These are: 1. Length 2. Cross-sectional area 3. Resistivity 4. Temperature
The longer the wire, the higher is its resistance. Resistance is directly proportional to length.
The bigger the cross-sectional area of the wire, the lower is its resistance. Resistance is inversely proportional to the cross-sectional area
Wires of different composition have different resistivity ( ) The higher the resistivity of the wire, the higher is its resistance. Resistance is directly proportional to the resistivity.
Effect of temperature on resistivity and resistance