What is resistance wire, and how does the resistance change when the resistance wire is folded 1

Resistance wire is a type of conductor with a specific resistance value, commonly used in circuits to limit current, convert electrical energy into thermal energy, or serve as the primary material for resistive components. It is made from various materials, including nichrome, copper-nickel alloys, platinum, and others, each with its own specific resistivity and temperature resistance properties. The resistance value of the wire depends on its material, length, cross-sectional area, and temperature.diode

Resistance wire has a wide range of applications, including heating elements, resistors like the AVP32F335QP176S, and fuses. In electric heating devices, resistance wire heats up by passing electric current, converting electrical energy into thermal energy for purposes such as heating, baking, and melting. In electronic circuits, resistance wire functions as a resistor, regulating current flow through its resistance value to ensure circuit stability and adjustment.diode

Before discussing how the resistance changes when a resistance wire is folded in half, let's first understand the basic formula for calculating resistance: [R = ρ * (L/A)], where (R) is the resistance value, (ρ) is the material's resistivity, (L) is the length of the resistance wire, and (A) is the cross-sectional area. When the resistance wire is folded in half, its length (L) is halved, while the cross-sectional area (A) doubles (assuming the two folded parts of the wire perfectly coincide). According to the resistance calculation formula, how will the resistance value (R) change?diode