How to calculate ohms per coil when the wire states ohms per foot?

[guy]

Hopefully not a stupid question! For example, eyeing up some wire that states the resistance is 1.73 ohms/ft? So any way to calculate what 5 wraps with a 3mm ID would be?

 

[nwhornet]

Hopefully not a stupid question! For example, eyeing up some wire that states the resistance is 1.73 ohms/ft? So any way to calculate what 5 wraps with a 3mm ID would be?

Steamengine is your friend. www.steam-engine.org/coil.html

 

[Phat Barstood]

Failing that good advice,build on a regulated mod or a coil master rig and it'll tell you the ohm's.

 

[speedfreek67]

Hopefully not a stupid question! For example, eyeing up some wire that states the resistance is 1.73 ohms/ft? So any way to calculate what 5 wraps with a 3mm ID would be?

Well, pi times diameter equals circumference.

So 3.14 x 3mm = 9.42mm per wrap.

But each wrap will be slightly longer than that, as the thickness of the wire offsets the next wrap, so each loop is slightly diagonal on the coiling rod. So let's just call it 10mm per wrap.

Multiply that by 5 wraps = 50mm.

Add 5mm legs at each end to make a total of 60mm wire length.

A foot is 305mm.

60 / 305 = 0.197 feet

1.73 x 0.197 = 0.34 ohms.

*ish*

 

[nwhornet]

Well, pi times diameter equals circumference.

So 3.14 x 3mm = 9.42mm per wrap.

But each wrap will be slightly longer than that, as the thickness of the wire offsets the next wrap, so each loop is slightly diagonal on the coiling rod. So let's just call it 10mm per wrap.

Multiply that by 5 wraps = 50mm.

Add 5mm legs at each end to make a total of 60mm wire length.

A foot is 305mm.

60 / 305 = 0.197 feet

1.73 x 0.197 = 0.34 ohms.

*ish*

Easier with Steamengine, I'd get a headache doing it that way

 

[mattyk2010]

Well, pi times diameter equals circumference.

So 3.14 x 3mm = 9.42mm per wrap.

But each wrap will be slightly longer than that, as the thickness of the wire offsets the next wrap, so each loop is slightly diagonal on the coiling rod. So let's just call it 10mm per wrap.

Multiply that by 5 wraps = 50mm.

Add 5mm legs at each end to make a total of 60mm wire length.

A foot is 305mm.

60 / 305 = 0.197 feet

1.73 x 0.197 = 0.34 ohms.

*ish*

^^^^^^
Wizard for sure [emoji3]

 

[tony68]

Well, pi times diameter equals circumference.

So 3.14 x 3mm = 9.42mm per wrap.

But each wrap will be slightly longer than that, as the thickness of the wire offsets the next wrap, so each loop is slightly diagonal on the coiling rod. So let's just call it 10mm per wrap.

Multiply that by 5 wraps = 50mm.

Add 5mm legs at each end to make a total of 60mm wire length.

A foot is 305mm.

60 / 305 = 0.197 feet

1.73 x 0.197 = 0.34 ohms.

*ish*

I need to wallpaper gonna PM you

 

[nwhornet]

^^^^^^
Needs to get out more [emoji3]

FTFY

 

[speedfreek67]

Easier with Steamengine, I'd get a headache doing it that way

So what answer do you get from steam-engine?

 

[nwhornet]

So what answer do you get from steam-engine?

Depends what AWG/wire type I put in