Resistance

Resistance

A measure of the opposition to the flow of current in an electrical circuit, influenced by material properties, length, cross-sectional area, and temperature.

Resistivity

A material's intrinsic property that quantifies how strongly it opposes the flow of electric current.

Voltage drop

The reduction in voltage in an electrical circuit between two points, often caused by the resistance of the conductors.

Continuity resistance

The end-to-end resistance of an electrical conductor; must be low to enable maximum current flow.

Insulation resistance

The resistance offered by insulating materials to the flow of current, preventing leakage.

Ohmmeter

An instrument used to measure electrical resistance.

Series circuit resistance formula

For resistors connected in series, the total resistance is the sum of individual resistances: R_total = R1 + R2 + ... + Rn.

Cross-sectional area effect on resistance

Resistance is inversely proportional to the cross-sectional area; increasing the area decreases resistance.

Resistance proportionality

Resistance is proportional to the length of a conductor (R ∝ L) and inversely proportional to the cross-sectional area (R ∝ 1/A).