Question

How does the resistance of a conductor depend on:
Length of the conductor?
Area of cross-section of the conductor?
Temperature of the conductor?

Answer 1

Hint: Resistance is the value of the opposition to the current flow in an electrical circuit. It is measured in Ohms. Thus, it is described well by Ohm’s Law. It is the ratio of voltage and current. Resistance also has a relation with the length, area of a conductor, and also it varies with temperature.

Complete step-by-step solution:
Resistance may be a measure of the opposition to the current flow in a circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω)
a) Length:
Resistance is directly proportional to the length of the conductor. So, as the length increases, the magnitude of resistance increases.
b) Cross-sectional area:
Resistance is inversely proportional to the cross-sectional area of the conductor. Thus, the resistance of the conductor decreased with the decrease in cross-sectional area.
c) Temperature:
Resistance is directly proportional to the temperature of the conductor. If the temperature is increased, the resistance is additionally increased.

Note:It is vital to notice that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is that the less resistive it will be. By utilizing the resistance of a conductor, light is often created in an incandescent light bulb. In an incandescent light bulb, there's a wire filament that's a particular length and width, thus providing a particular resistance. If this resistance is simply right, the present flowing through the wire is slowed only enough, no end as a result of an excessive amount of resistance, that the filament heats up to the purpose that it glows.