What factors determine the resistance and inductance in a coil?

  • #1
Milas
3
0
TL;DR Summary
Hi

what factors determine the resistance and inductance in a coil and they related i.e. if the resistance is high would the inductance be high ? Additionally, would the resistance and inductance value change over time? I only ask this as we tested the resistance and inductance on our coils after a few months and saw a drop off in both the resistance and inductance values

Thanks in advance
Hi

what factors determine the resistance and inductance in a coil and they related i.e. if the resistance is high would the inductance be high ? Additionally, would the resistance and inductance value change over time? I only ask this as we tested the resistance and inductance on our coils after a few months and saw a drop off in both the resistance and inductance values

Thanks in advance
 
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  • #2
Hello @Milas ,
:welcome: ##\qquad ##!​

Here at PF we value some initiative: what did you find out about inductance from a google expedition so far ?

Is this schoolwork ? Please describe what you did (what coils ?) and what you know already

##\ ##
 
  • #3
How did you measure the resistance and the inductance?
 
  • Like
Likes DaveE and berkeman

What factors influence the resistance of a coil?

The resistance of a coil is primarily determined by the material of the wire, its length, and its cross-sectional area. Materials with higher resistivity, such as nichrome, offer more resistance than those with lower resistivity like copper. Longer wires provide greater resistance, and thinner wires have higher resistance than thicker ones due to a smaller cross-sectional area through which current can flow.

How does the wire diameter affect the inductance of a coil?

The diameter of the wire affects the inductance of a coil because a thicker wire can reduce the overall inductance. This is due to the increased diameter causing a reduction in the magnetic field per turn of the coil. Additionally, thicker wires can decrease the resistance, allowing for a higher current and potentially altering the magnetic properties of the coil.

Does the coil shape influence its inductance and resistance?

Yes, the shape of the coil significantly influences both its inductance and resistance. Coils with more turns will generally have higher inductance due to the increased magnetic field interactions between the turns. The shape, such as whether the coil is wound as a solenoid or a toroid, also affects the magnetic flux density and the efficiency of the coil in inducing a magnetic field. Resistance is influenced similarly, as more compact shapes can reduce the length of wire needed, thus reducing resistance.

How do the core material properties affect a coil's inductance?

The core material within a coil plays a crucial role in determining its inductance. Materials with high magnetic permeability, such as iron or ferrite, enhance the coil's ability to concentrate magnetic flux and significantly increase its inductance. Air cores or non-magnetic materials, on the other hand, result in lower inductance values. The saturation point of the core material also affects inductance, as materials that easily saturate may limit the inductance under high current conditions.

What impact does temperature have on the resistance and inductance of a coil?

Temperature changes can significantly affect both the resistance and inductance of a coil. Typically, an increase in temperature will cause an increase in resistance due to the increased atomic vibrations within the metal, which impedes the flow of electrons. For inductance, the effect can vary; in ferromagnetic core coils, higher temperatures can decrease the material's permeability, thus reducing inductance. In contrast, the inductance of air-core coils is generally less affected by temperature changes.

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