- #1
GumzyG
- 6
- 0
Hi, can someone please explain to me what resistants is affected by in a wire and also what temperature has to do with it?
Thanks in advanced
Thanks in advanced
Resistance is a measure of the hindrance or opposition to the flow of electric current through a metal wire. It is caused by collisions between the electrons and the atoms in the wire.
The resistance of a metal wire is determined by its length, cross-sectional area, and the material it is made of. Longer wires and wires with smaller cross-sectional areas have higher resistance, while wires made of materials with lower conductivity have higher resistance.
As the temperature of a metal wire increases, the atoms in the wire vibrate more and increase the number of collisions with the electrons, resulting in higher resistance. This is known as the positive temperature coefficient of resistance.
The formula for calculating resistance in a metal wire is R = ρL/A, where R is resistance in ohms (Ω), ρ is the resistivity of the material in ohm-meters (Ω•m), L is the length of the wire in meters (m), and A is the cross-sectional area of the wire in square meters (m²).
The resistance of a metal wire can be reduced by using a shorter wire, increasing its cross-sectional area, or using a material with higher conductivity. Keeping the wire at a lower temperature can also help reduce resistance.