What factors determine the resistance and inductance in a coil?

In summary, the resistance and inductance in a coil are influenced by several factors including the coil's material properties (such as resistivity of the wire), the number of turns in the coil, the coil's dimensions (length and diameter), the frequency of the current passing through it, and the presence of a magnetic core. Resistance is primarily affected by the wire's length, cross-sectional area, and temperature, while inductance is determined by the coil's geometry and how effectively it can store magnetic energy.
  • #1
Milas
3
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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?
 
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Likes DaveE and berkeman

FAQ: What factors determine the resistance and inductance in a coil?

What factors determine the resistance in a coil?

The resistance in a coil is primarily determined by the material of the wire (its resistivity), the length of the wire, and the cross-sectional area of the wire. Higher resistivity materials, longer wires, and smaller cross-sectional areas all contribute to higher resistance.

How does the number of turns in a coil affect its inductance?

The inductance of a coil increases with the square of the number of turns. This means that if you double the number of turns in a coil, the inductance will increase by a factor of four, assuming all other factors remain constant.

What role does the core material play in determining the inductance of a coil?

The core material greatly influences the inductance of a coil. Materials with higher magnetic permeability, such as iron or ferrite, can significantly increase the inductance compared to a coil with an air core. The core material helps to concentrate the magnetic field, thereby increasing the inductance.

How does the coil's geometry affect its resistance and inductance?

The geometry of the coil, including its diameter, length, and the spacing between turns, affects both resistance and inductance. A larger diameter and longer length can increase inductance, while tighter spacing between turns can also increase inductance but may increase resistance due to more wire being used. Conversely, a shorter coil with fewer turns will have lower inductance and resistance.

Why does the frequency of the current affect the inductance of a coil?

The frequency of the current affects the inductance of a coil due to the phenomenon known as skin effect, where higher frequencies cause the current to flow primarily on the surface of the conductor, effectively reducing the cross-sectional area and increasing resistance. Additionally, higher frequencies can lead to increased energy losses in the core material due to hysteresis and eddy currents, which can alter the effective inductance.

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