# Nichrome wire help

#### Slowbutsure

Feb 18, 2018
21
Goes without saying that you should have a fuse but not for control of the heat, rather to protect against faults.

Now is where things start to get more complicated and, as larger currents are involved, more expensive.

To begin with you need to measure the current that the circuit is drawing to get some idea of the size of any switching or voltage drop devices.

This hit and miss method you are using could go on for years which is why theory was invented. One alternative is make it variable.

Do you mean a variable resistor?

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,509
No. I'd use a pair of pliers.

If it's getting too hot then make the wire longer. That will increase the resistance, lower the current, thus the total power (along with the power per unit length) and therefore reduce the temperature.

If you need the same amount of heat, but the wire is getting too hot, then you need multiple (n) lengths of wire, n times longer, all placed in parallel.

Last edited:

#### Slowbutsure

Feb 18, 2018
21
No. I'd use a pair of pliers.

If it's getting too hot then make the wire longer. That will increase the resistance, lower the current, thus the total power (along with the power per unit length) and therefore reduce the temperature.

If you need the same amount of heat, but the white is getting too hot, then you need multiple (n) lengths of wire, n times longer, all placed in parallel.

Ok, thanks. Means I will need to order some more silicone sheet and more wire but sounds like the only way to go.

#### Bluejets

Oct 5, 2014
6,595
Not the only way but most likely the simpler and cheaper alternative.

Alternative involves pulse width modulation and (relatively) high current switching devices.

#### Chemelec

Jul 12, 2016
291
Make (or Buy) a PWM Controller.
So you get a Variable Temperature Heating.

#### Slowbutsure

Feb 18, 2018
21
Make (or Buy) a PWM Controller.
So you get a Variable Temperature Heating.

Thanks, ive ordered one to give it a try.

#### Chemelec

Jul 12, 2016
291
There are Some on my Website as Projects and have some Kits Available.
But I Don't actually build them as a Finished Product.

If you buy One, It needs to be made for 12 Volts and capable of delivering the required Current to your Nichrome wire.

Curious, What kind of Silicone are you using to Handle the Heat?

Feb 18, 2018
21

Jul 12, 2016
291
OK

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,509
The PWM controller is fine if you want to reduce the temperature of the wire and also the total amount of heat.

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