The resistance of a conductor depends on the:
Length, area of cross-section, material of the conductor, and temperature
The resistance of a conductor is given by \(R = \rho \dfrac{L}{A}\), where L is the length, A is the area of cross-section and \(\rho\) is the resistivity of the material.
Resistance is directly proportional to length and inversely proportional to area of cross-section, and resistivity itself depends on the nature of the material and changes with temperature.
Voltage and current do not determine resistance; by Ohm's law R is the fixed ratio V/I and stays the same even when V and I change together.
"Length and area only" is incomplete, as it ignores the material and temperature.
Hence, resistance depends on length, area of cross-section, material of the conductor, and temperature.
Two resistors of 2 Ω and X Ω are connected in series to a 10 V battery. If the current flowing through the resistors is 2 A, then what will be the value of X (in Ohm)?
Which of the following symbols represents a rheostat?
If an electric heater consumes 1000 W of power, how much electrical energy does it use in 1 hour?
According to the right-hand thumb rule, if the thumb points in the direction of current, then the fingers show:
A straight conductor carrying current is placed parallel to a uniform magnetic field. The force on the conductor will be:
_______ is a simple device that is used to either break the electric circuit, or to complete it.
When the material is cooled down under its critical temperature, which of the superconductor attains accidentally zero?
The most commonly used electrical conductor is-
The gas usually filled in the electric bulb is
_________ is the physical quantity of the substance which is numerically equal to the resistance of a rod of that substance which is 1 m long and 1 sq m in cross-section.