the specific resistance of a wire depends on which of the following factors
Answer:
The specific resistance of a wire is determined by several factors. These factors include:
-
Material: The type of material the wire is made of has a significant impact on its specific resistance. Different materials have different resistivities, which affect how easily an electric current can pass through the wire. For example, copper has a much lower resistivity compared to iron.
-
Length: The length of the wire also affects its specific resistance. As the length of the wire increases, the resistance also increases. This is because a longer wire has more atoms for the current to pass through, resulting in greater resistance.
-
Cross-sectional area: The cross-sectional area of the wire is another important factor. A wire with a larger cross-sectional area has less resistance compared to a wire with a smaller cross-sectional area. This is because a larger area provides more space for the current to flow through, reducing the resistance.
-
Temperature: The temperature of the wire can influence its specific resistance. In general, as the temperature of a wire increases, its resistance also increases. This is due to the increased atomic vibrations within the material, which obstruct the movement of electrons and increase the resistance.
-
Impurities and defects: Impurities or defects in the wire’s structure can also affect its specific resistance. For example, if there are impurities present in the wire, they can disrupt the flow of electrons and increase resistance.
It is important to consider all these factors when designing or analyzing electrical circuits, as they can significantly impact the overall performance and efficiency of the system.