Question

The resistance of wire is 1 ohm. Explain the meaning of this statement.

Answer 1

Hint: The flow of electrons that makes electric current encounters resistance when moving within the body. This resistance is called the resistance of the conductor. It depends upon the length of the conductor, area of cross-section of the conductor and the Resistivity of the material of the conductor and the relation between them is given below. Resistance, Potential difference and the current of an electric circuit are related, the relation is given below.
Formula Used:
\[R=\rho \dfrac{l}{A}\]
\[V=IR\]

Complete answer:
Electric current is basically the flow of electrons through the conductor. The flow of electrons is due to the potential difference between the ends of the conductor. This flow of electrons encounters resistance when moving within the body. The resistance depends upon the length of the conductor, area of cross-section of the conductor and the Resistivity of the material of the conductor. This relation is formulated as
\[R=\rho \dfrac{l}{A}\]
The standard unit of resistance is Ohm.
Electric current flowing through the conductor, the potential difference and the resistance of the conductor or wire is related as
\[V=IR\]
Or, \[R=\dfrac{V}{I}\]
It can be seen from the expression that if resistance increases then for keeping the electric current constant, we have to increase the potential difference.
The resistance of a wire is 1 ohm, meaning that for a current of 1 Ampere to flow through the wire, 1 Volt of potential difference is required. Or, when the potential difference across the ends of the wire is 1 Volt, then a current of 1 Ampere flows through it.

Note:
The resistance of different materials vary vastly and this property has been exploited for many practical purposes. The electric bulb uses high resistance filament for light. Wires have a coating of material with extremely high resistance, called insulators. Wires of low resistance and high cross-sectional area are used to carry electric current to long distances. This ability to control resistance by controlling the physical properties of conductors is highly useful in the real world.